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COLOR VISION TEST

2011-07-27T18:00:00.000+07:00

Currently certified for color blind shall be declared to be necessary for some jobs such as doctors, pilots, chemists, electrical, interior design experts, graphic and so forth. This certification is required in order to prevent negligence / accidents at work due to disturbances in color vision. Accidents can be detrimental to the person concerned or other residents. To get a driver's license in some countries there are allowed but not for public transport drivers, bus or taxi. If it becomes an interior design expert will have difficulty on color perception. However, not all jobs require independent feasibility color blind.

Color blindness is a condition in which one can not distinguish certain colors, and generally occurs due to inborn abnormalities and lowered. Red-green color blindness is the most common form of color blindness, about 99% of all people with color blindness, where people can not distinguish red and green. Another form is the blue-yellow color blindness, but it is rare, and are more often associated with diseases that arise as an adult. Total color blindness, where a person can only see shades of gray but very rare.

The incidence of color blindness people world is not known with certainty, but in Europe an estimated 8-12% of men and 1% of women suffer from color blindness. Women can be carriers (carrier) chromosome for color blindness, although the clinical day-to-day is not color blind.

BLACK HOLE

2011-07-20T21:19:00.001+07:00

Black hole is an object that its density is very high so that can trap light forever. This is a very interesting electronic effects seen from the nature of light gravity. When the frequency is concerned with photons moving towards the earth increases, the frequency of photons moving away from Earth must diminish.

Earth's gravitational field is so strong, but the gravitational field of many stars is very strong. For example the frequency of photons originally emitted by a star f mass M and radius R, as in the equation of Newton's laws of gravity.

At a great distance from the star as on earth, the photons are beyond the reach of the gravitational field of a star, but its total energy fixed. Photon energy was now entirely in the form of electromagnetic waves with frequency f shows coming.

TEACHERS AND THE QUALITY OF EDUCATION

2011-06-12T18:51:00.001+07:00

Education is one very important factor for a nation. The importance of the role of educators to determine the quality of education. Teachers and principals are in the forefront in education, because they are one of the executors of education, making up the curriculum, programs, and providing infrastructure facilities to support the quality of school education.

The quality of teaching and learning process will run optimally when all the programs run well and in line with expectations. It can provide a very large contribution in the efforts to improve the quality of education.

To improve the quality of education, the role of the teacher's performance is very possible to support school programs. So the teacher would be proud of the profession, because the profession is not just a job for a living, but have to serve education. This causes less teacher loved his job, so teachers are not really in carrying out their duties properly.

The existence of teachers' lack of passion in performing the task, lack of discipline, lack of respect for the principal, lack of cooperation among school personnel. Not feel at home in school and the high rate of displacement or the turnover of teachers. Is an indicator that teachers lack motivation at work.

This condition is a picture of most of the teachers during this time.

If this issue is not even allowed to get special attention for granted, including the principal, Karen is not infrequently there is also the principal who did not feel at home in school, then the quality of the learning process will remain low. Making it impossible effort to improve the quality of education will not achieve maximum results and significant.

More Light, more thin, more Fast For Apple iPad2

2011-05-10T06:12:00.019+07:00

Last year Apple released its first tablet computers: iPad. Not only succeed in sales success, iPad also succeeded in forcing other vendors to follow in his footsteps by releasing a tablet pc with the same dimensions and function.

On March 11, Apple launched the first-generation successor iPad. Some deficiencies in the first iPad began equipped. Also dimensions of the increasingly thin and lightweight make iPads two feasible to own.

Available in 3 variants for the global market that is iPad 2 CDMA, iPads 2 wi-fi, iPad 2 wifi and 3G. Physically, the diagonal iPads 2 is not different from the first iPad is 9.7 inch. However, only 8.8 millimeters thinner.

Gyro sensor technology that is injected, making the iPad 2 is able to identify all premises positions better. Also adding features. These features are 5 megapixel camera on the back of exposure capable of producing up to 720p @ 30fps video. In front, an additional VGA camera with built in audio add the option more attractive means of communication. There are video features geotagging via wifi for those who want to share location with colleagues.

SOURCE WATER IN NATURE

2011-05-09T06:28:00.002+07:00

Water is an important component in the ecology, the component that is needed by life. Water sources that exist in nature is the sea, lake, river, underground water, water in the Atmosphere

Sea
Sea is a vast collection of salt water and is associated with the ocean. Sea water consists of a mixture of 96.5% pure water and 3.5% other materials and mineral salts. Sea water is the biggest stock in the wild, With a volume of 97.41% of the total water available in nature. Ocean has a significant contribution to the dynamics of the hydrologic cycle.

Lake
The lake is one of baentuk ecosystem that occupies a relatively small area on the surface of the earth in the appeal by the Sea and mainland habitats. For humans the existence of the lake is very meaningful as supporting the needs of the household, industrial, and tourism peartanian. Lake parking lot while the water before reaching shore, the lake is fresh water reserves on the mainland.

River
Every drop of water that falls to the surface rain land is a small blows to the soil. This blow broke the ground into granules and very small particles which then flows into the pores of the mud covering the land so that impede the flow of water that will soak into the ground. So that water will find the road to places that carry a lower gravity. The flow of water will form small grooves. Minor grooves come together to form trenches that eventually form the rivers that drain the water towards the sea.

Water underground
To mainland 98% of all water on land hidden beneath the ground surface in rock pores and grain ingredients. The remaining 2% is seen as rivers lakes and reservoirs.

Water in the Earth's Atmosphere
In water the earth's atmosphere as an important component of the hydrological cycle. The water contained up to 12.000 up to 14.000 meters altitude

Water contained in the atmosphere in three forms, namely the invisible vapor in the liquid form of granules, and crystalline ice. The two last shapes are visible in the outpouring of rain, hail and snow.

LEARNING CONCEPT

2011-05-08T05:24:00.000+07:00

Learning in a narrow sense is the process of obtaining knowledge by reading and using the experience as knowledge that guides behavior in the future. Learning according to Psychology expert, learn dalah individual psychological processes in their interactions with the natural environment. While education experts see learning behavior as a psychological-pedagogical process characterized by the interaction of individuals with a learning environment that was deliberately created.

Definition of a comprehensive study by Bell-Gredler (1986) which states that learning is a process conducted by humans to get a variety of competencies, skills, and Attitudes, or the ability, skills and attitudes. The three capabilities are acquired in stages starting from infancy to old through a series of lifelong learning process. The series of the learning process was conducted in the form peandidikan involvement in formal, nonformal and informal.

Learning as a humane process has an important position and role, both in public life trdisional and modern society.

Learning is often defined as the addition of the expansion and deepening of knowledge, values and attitudes and skills according to Fontana sense conceptually learning is a process that is relatively permanent changes in individual behavior as a result of experience.

According to Gagne learning is a change in the addition of the ability of long-standing and not from the growth process.

And much more sense to learn that have not mentioned all here
So based on some understanding of the above study we as humans need and have lifelong learning as long as we live in Al-Quran Iqro bismirobbika ladzi kholaq (please read this universe by the name of your god) or the Chinese proverb "to the land despite Learn (learn about anything and from anyone and anywhere), Bend the willow Pls it is young (educate children while still young). Berakit kehulu-raft swam to shore (first was to learn later will enjoy the results.)

(Various sources)

EYE AS A SIGN OF LIFE

2011-05-04T19:51:00.002+07:00

Any closely as a doll with a human face, people can still tell the difference. The scientists found that the eyes make the face look alive as a differentiator between living beings with inanimate objects. Because of his expertise in an artist can make the face look alive painting lies in the eye.

A study in the journal Psikologycal diplubikasikan science find that a face should be very similar to the human face to look alive, and the key is in the eye. Some artists have tried to make an animated movie man but failed to "turn" as an animated character in the movie Polar Express, which makes the audience uncomfortable because it seems less alive.

"There are important things about seeing the face of fundamental importance that there is life in it" by Thalia Weatly from Dartmouth College, Hanover. Who conduct research studies with Cristian Looser. Humans can see a face in a variety of objects. Wheatley and Looser trying to figure out which part of the face that makes it appear alive. Looser dolls come to shop in New Hampshire and photographing the doll's face. Photos of each doll's face compared with similar images of human faces. Looser using morphing software to combine them, resulting in a half-man half-doll image.
Volunteers are asked to choose which images where images of human and puppet. In that experiment, Looser and Wheatlley found that the eyes are the most important feature to determine whether the face is alive or not "I think we're all looking for relationships with other people" Wheatley said: "When we recognize there is life in a face, we would think this is mind can I contact.
A face seen alive at least as well as in painting the face, either fictitious or real face of the face-painted artist. According to a painter who did not want his name mentioned that a visible face painting for life or death lies in the eye, moreover, the eyes can show whether those faces are sad .. excited, or happy in a difficult situation. Mona Lisa painting that makes people fascinated by his eyes showed that the face was really alive. Or, self portrait paintings by Affandi also showed that the eyes which is the cause of the painting is really alive.

(Source Koran Tempo)

SPIRIT EDUCATION DAY 2011

2011-05-02T19:43:00.005+07:00

May 2, which is celebrated as a day of National Education is a very historic day as the birthday of the National education leaders Ki Hajar Dewantara founder of Taman Siswa school. He is an activist for the independence movement and pioneer of education for the indigenous masses. By establishing college students park on July 3, 1922: Nationaal Onderwijs Instituut Tamansiswa or the National Education Tamansiswa the indigenous masses to obtain education in the Dutch colonial period. Because at that time only the nobility is entitled to education.

In today's education has been almost uniformly to all layers of society, in the presence of 6-year compulsory education program and continuing with 9-year compulsory education program. The problem is not accompanied by equitable distribution of education quality. The apparent improvement in quality in cities is also characterized by an increase in educational facilities but in areas remote learning facilities are lacking.

In colonial times there is separation or box boxes (classification) school for sinyo and Noni (Neaderland child), the son of nobles and commoners.

So in today's classification occurs based on class economic strata, eg the rich and the smart kids go to school in the SBI (School of International fare), the son of a smart but poor parents regular school, children are less intelligent and less capable parents are forced to going back to school in the suburbs or a free course when junior.

Very ironic one friend gave her tips on order can be accepted at one school SBI famous "so do not write on the form is received maternal employment: teachers have enough work of his father" means that the child will not be in receipt of teachers in schools SBI, crazy right ... that when his mother was a teacher how when her father was a teacher, or their parents have a lower economic level of teacher .....?

Actually, the admissions committee (selection) is not like that they still will accept students who truly have the ability to maintain high academic quality. Because in reality people can not afford any child can attend school with a full course of SBI. But because the opinions and gossip in the embedded community that the students' parents of small donations will not be accepted. School of International fare mainly from the graduates. Do not let the pun-cost international schools attached forever.

(referensi :Wikipedia.org )

Congratulations on the release of 20 Indonesian sailors held hostage by Somali pirates

2011-05-01T19:37:00.001+07:00

Ships NV Sinar Kudus in sandra the pirates with 20 sailors managed government freed after a month or more at the mercy of the pirates of Somalia. Released on Sunday at 17:10 pm. Dated May 1, 2011 by paying the ransom.

According to the Head of Information Centre for the Navy the option is taken at the request of the union captain and sailors of Indonesia and the family as for the safety of the sailors, in a press conference before the national media.

With that, the next step necessary to find a solution to the problem so that the ships through the waters of Indonesia which is not in the Arabian sea by the pirates pirates anymore. Very worried if the ships trading in Indonesia through the place at Plough pirates because they expect a ransom. Could be held under guard by soldiers of the Sea?

Whatever the steps taken was the best hope, life safety of citizens is more meaningful than material possessions.

WHO IS THE BEST RONALDO OR MESSI?

2011-04-30T06:00:00.012+07:00

Who is the best Lionel Messi or Cristiano Ronaldo? Many soccer analysts, coaches and players busy-busy providing an assessment of the second figure of the soccer star. Among both men have a deficiency and excess, but in the first Champions League Semi Final, Thursday, 28/4/2011 at the Santiago Bernabeu, Messi better than Ronaldo.

Argentine Star game that makes the Real Madrid defender so overwhelmed twice successfully break down the best goalkeeper Iker Casillas Spain at this time. Thousands of people watched the action at the Stadium Messi, Millions of football fans spellbound with Messi they witnessed the greatness of the television screen in their respective Houses.

Analysts and television reporters were all praised Messi. But whoever is the best Messi or Ronaldo make sure you watch a football game fight with your television picture quality is the best result of digital technology.

Watching the Champions League then became increasingly cool together

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MOOD PRINCESS DIANA WEDDING PRESENT MARRIAGE BACK KATE AND WILLIAM

2011-04-28T19:03:00.018+07:00

Kate Middleton and William's wedding was the first royal wedding of the century that witnessed directly nearly two billion people in the world through technology youtube and iPods.

The atmosphere of the wedding and funeral of Princess Diana's wedding procession echoed back in Prince William and Kate Middleton. The atmosphere is presented through music that is played when Lady Diana married and buried. The same music playing when the prince Charles married again with Camilla, Duches of Cornwall in 2005.

In preparation for the wedding of Charles Middleton help choose the music to listen to on iPods "kate is very familiar with classical music" he's got a lot of input from the Prince of Wales (Prince Charles)

You also can bring the same atmosphere with the presence of iPods in your hands immediately visit our online store and the message immediately.
Of all the eyes of the world's population who witnessed their marriage, we would like. Congratulations William and Kate's happy, congratulations To the people of England. May they be happy forever

Should there Citarum River Management

2011-04-24T12:44:00.003+07:00

Heavy rain flushe Watershed (DAS) Citarum apparently caused overflowing dam in Purwakarta Teak noble province of West Java and flooding in some places in Karawang, Puwakarta and Bekasi including some districts in sauth Bandung area.

In the rainy season which began in October very high rainfull river into the dam Jatiluhur very abundant, but the drought water shortage mainly as a driver of the turbine for Water Power (hydropower). Overflowing water in the dam due the damage Jatiluhur Watershed (DAS) is increasingly Citarum.

The places of origin such as mountain forests Puppet, mountain Patuha as well as areas upstream of Citarum Bandung Lembang and Dago north all have experienced very severe damage, these areas rivers emptying into Citarum, including the city of Bandung basin through which the river Cikapundung finally culminated in the Citarum.

In the northern region of origin Bandung Regioanal Open Space Green (DRTH) now has turned into a luxury residential area of housing and Villa. In the southern part of Bandung was no less corrupt than the housing there is also industrial plants. Factories and housing many displaced Regional Open Space Green so field which is the parking lot nex to water seep into the ground. With the reduced area of green open space will direct rain water into thr river so that flooding downtrtream areas Citarum.

Necessary cooperation between all stakeholders, including decisive action from govermant and public awareness of the importance of maintaining the environment. Government supposed not easy to give building permits and all the activities that will change the green open land to other functions, and if there is a need to act firmly against and no selective logging.

Region handling Citarum river flow to a special institusion that handles as Ciliwung and Cisadane river passing through the area of Bogor. Citarum and other rivers in Indonesia need supervision and maintenance of the estuary from upstream to avoid conflicts of interests between the various interest of the special management needs that handle the director-general level.

Free Ship NV Sinar Kudus

2011-04-20T12:35:00.003+07:00

For days the ship NV Sinar Kudus are in the hostage-pirate (pirate), Somalia and the center of attention all of us because the story becomes a media head lines. Where they seized the ship and its sailors who totaled 20 people, and all citizens of Indonesia, the purpose or motive hostage by pirates (pirates of the Sea) is nothing but the amount of the ransom demand of $ 4 million, surely the number is not small.

But for the sake of honor as a sovereign nation and to provide a sense of security to Indonesian citizens both at home and abroad, the government should make the release by sending military troops. This was never done by other countries whose vessels had experienced the same trade that is India, Malaysia, and South Korea.

We could follow the will of the pirates by paying a ransom, the amount of $ 4 million, not much compared to the lives of 20 citizens and cargo ships. If the company or the State to follow the will of the pirates then the effect is not good for the future of our military a bad image, we are ashamed at the neighboring countries (Malaysia). Our economy will be costly because there are no hidden costs at any time is set aside for boarding a ransom, Indonesian-flagged vessels passing each must be set aside Japrem (ration Thugs) for pirates.When the ship was released by our military in addition to providing security and protection also adds a sense of pride and nationalism good for the military itself mauapun all citizens both inside and outside the country. With this easy easy way contribute to the educational vision of nationhood that were adopted back in school-school, although the concept is not yet clear.Indonesia has good relations with Middle Eastern countries including Somalia itself. Then we can ask for a little help intelligence information about the Arab sea area. The UN mission in the Gaza Strip task Indonesian troops from 34 countries get the best value. then it can be utilized to seek support from middle eastern countries or regions around the Arabian sea.If we choose this option then the military shipments must be very secret. Mass media should not be excessive boasting and the government immediately asked that the company immediately release the ship owner because in a way that would not solve the problem, even according to the ambassador of Somalia that could harm the hostages and benefit the pirates because it was getting cold.Surely the release of hostages in any way need to plan and proper preparation for the release of this real world is not like a story in The Pirate Hunter: The True Story of Captain Kidd or the Pirates of Silicon Valley, is equally a story he called in the following book if aPirate I Must Be. .: The True Story of Black, King of the Caribbia, Bedtime Stories for Pirates, and Arcadia-The Secret Story of Its Construction

WE ARE STATE AFFAIRS disaster

2011-04-12T12:17:00.003+07:00

The title above was apparently not too much that's the state of our country called the Republic of Indonesia in October this at least three events that claimed many lives in the same time on an island in the eastern tip of Papua named by the beauty and abundant natural wealth occurred with flash flood fatalities more than 250 people, a small town in West Papua Wasior exactly devastated hit by floodwaters coming from the mountain. By simultaneously the observer and environment observer blamed the forest encroachers and illegal logging but that was denied by the government by reason of flooding due to rainfall that is too high and steep geographical circumstances.

Not yet subsided grief enveloped the nation of Indonesia, on Monday, October 25, 2010 in the Mentawai islands west of Sumatra island in West Sumatra province exactly famous for its beautiful tourist surfing enthusiasts there was an earthquake measuring 7.7 Richter accompanied by a tsunami that claimed over 400 lives and reported 500 people still missing.

On the day Tuesday, October 26 eruptions occur most active volcanoes in the world, Merapi, located on the border of Central Java and Yoyakarta least take as many as 36 people dead including Merapi gatekeeper known and famous since 2006 when Mount Merapi erupted.

That's what our country is full of domestic disaster at sea, the mountains and on the mainland recently Train collision accident which took lives of 30 people more. If you return to the past starting in 2004 many of the calamities that befall this country in Aceh by the earthquake and tsunami, earthquake and the eruption of Mount Merapi in Yogyakarta in 2006, an earthquake and tsunami in West Java Pangandaran, West Sumatara earthquake, earth quake in Tasik Java West. Bad weather which resulted in the planting and harvesting seasons of uncertainty. If it's like this there was nothing we could do besides introspeki to yourself as a human being is a natural manager and not as a ruler who wishes to exploit nature without taking into account the negative impact of all activities, and return to prostrate and devoted to the mighty power of the hope all This is not a punishment for us but just a warning and reprimand from God who created man and nature is beautiful, hopefully we can still be thankful and bowing to him, with live and through all the trials and these trials so that God will show the right way for us, and blessing of all this misfortune Amiin

Reflecting FROM JAPAN NUCLEAR ACCIDENTS NUCLEAR PROGRAM INDONESIA SHOULD NOT be forwarded

2011-04-09T11:50:00.001+07:00

I wish our condolences and deep sorrow in her to the Japanese people who are experiencing a very big disaster. Hopefully Japan a great nation as a high civilization can be through and through this tragedy.

In terms of the number of fatalities is estimated at more than 10 thousand inhabitants due to the tsunami swept away, there is a greater danger threatens the nation of Japan where the government is trying to overcome that nuclear leakage are two of the four tsunami-affected reactor leak, due to a breakdown in the reactor cooling components for a moment after an earthquake off the electrical system, replacement usually occurs trsunami Logo generator so that the generators were swept, too, then cooling the reactor stops, when no refrigeration, the heat will accumulate in the reactor so that it can cause an explosion, when a reactor exploded, the core of Japan and surrounding countries in a state nuclear emergency. Hopefully the Japanese people can not handle it until what happened in Chernobyl Ukraine in 1986 where events reoccur at the Chernobyl nuclear accident takes lives of 5 million people.

Japan was the country best prepared than other countries in dealing with earthquake and tsunami, all have anti-earthquake design, but when faced with tsunami-resistant buildings do not exist, because the character of the force of water due to tsunami is different from power by the quake. At the time of the rising sea water into coastal water flows premises at 80 miles per hour but when entering the halls of the city of velocity and pressure can be increased to 200 miles per hour more because of the city drainage channel narrowing occurs because of the topography of the city, coupled with the material brought by water itself in the form of ruins of buildings, trees, boats, and vehicles.

Technological progress of a country can be seen from the level of electrical energy consumption, Japan as the country's industry was developed to have the electrical energy needs are very large. Based on the Japanese mainland has a natural topography that support for the production of hydroelectric power for many mountainous regions, but the rapid growth of Japan's economic power is not enough water, so as much as 30% of Japan's electricity needs are supplied from Nuclear Energy. Nuclear Power in the economic calculations turned out to be cheaper than coal, but higher than that technology was also the greater risks including the risk of possible accidents.

For countries which have natural resources such as natural gas and coal for example, Indonesia should use as a nuclear alternative energy sources be avoided. Given the side effects of the nuclear reactor that is directly harmful to the environment is global warming and radioactive waste. For the reactor cooling water is needed as a medium which removes heat from the reactor core and then the exhaust into the environment. So nuclear power to contribute part of the heat for the environment. Radioactive trash burning is the remnant of a very dangerous, because some elements will radioaktf meanjadi stable element means not emit radioactive rays (radioactive rays alpha, beta and gamma) after quite a long time until many decades. Obviously there are factors due to unpredictable third day after the accident factor as happened at Chernobyl and Fukusima.

What happens on this earth is a material reminder and reflection, for we are one human creature, and the only creatures who know the nature of civilization to manage his best not as a conqueror of nature. Often times the wrong perception that man can conquer nature, so that humans can exploit arbitrarily without considering the nature and considering the consequences. Man was created as a leader (Caliph) in a very broad sense. Can a leader for him, or lead the world, including to manage them. Any existing natural resources are all humans and their supporting ecosystems other creatures.

Earthquake and Tsunami Shows Human weakness

2011-04-05T11:41:00.008+07:00

On March 11, 2011 in Japan occurred off the east coast of tectonic earthquake measuring 8.9 on the Richter scale and recently revised by the Japanese authorities to 9.0 on the Richter scale followed by a tsunami that destroyed coastal cities in eastern Japan as Miyagi, Fukusima , Iwate, Sendai.

Sea water that rises to the land went into the outposts city with a speed of 100 miles per hour. Lantakkan devastating everything in its path starting from the debris-piuing building collapse due to earthquakes, ships, vehicles, all there is left intact. Those people who could not save themselves be dragged a very large flow of water in terms of speed and strength. Tsunami is a result of the earthquake, recorded the earthquake that almost the same strength of an earthquake in Chile in 1960 and the Province of Aceh Darussalam Indonesia in 2004.

Damage and loss of property other than loss of life estimated at more than 10 thousand people not including the missing. From start to damage to road infrastructure, buildings, office buildings, railroad, fire at oil refinery plant and the more dangerous is the leaking of a nuclear power reactor in Fukusima at the time of writing this there are 20 people registered for victims exposed to nuclear radiation. Tsunami warnings were sent to various countries which direct land border with the ocean fasifik such as the Philippines, Hawaii, United States and Indonesia. But for Japan's own domestic tsunami warning was not much help for tsunami warning for residents of Japan are close to the source of the quake only had about 6 seconds to save themselves.

Japan is a country that is very often affected by tectonic earthquakes because of its geographical position which is the meeting point of three tectonic plates. Of course, Japan has been studying earthquakes for hundreds of years how the ways to overcome earthquakes with various science and technology that they develop ways to overcome the earthquake. With their experiences, they create numerous test structures that are resistant to earthquakes and some even building premises as a motor vehicle use shochbreaker foundation so that buildings are earthquake-resistant goncanga to force 12 on the Richter scale.

Countries with which Japan is famous for its natural beauty, a high civilization, advanced country in the forefront of science and technology in Asia and the world were destroyed in the Tsunami lunge shows that humans are weak creatures of nature and God's presence. That humans and nature are equally God's creation. Man with high tech apaun with anything as good science remains weak in front of the great Creator Creator.

This is material for kitra renugan all recorded in history that humans are often dealing with major disasters such as floods such as narrated in the holy book the Koran and the Bible is the flood that drowned Noah and civilization. Human civilization is very easily lost and destroyed by the disaster. Such as in the history of Indonesia was buried two kingdoms of Tambora and Dompu due to eruption of Mount Tambora, or meletunya Mount Vesuvius that buried the nearby towns