That destroyed the great city of Mohen-jo-daro?

About four thousand years ago in the river valley and the ICC have quickly begun to develop two large cities - Horopa and Mohenjo-Daro. After some time, these cities became the center of a vast slave state. The territory of that State was twice as the Old Kingdom era of Egypt. Horopa and Mohenjo-Daro were different. Even in those days culture. Straight as an arrow cobbled streets, two-storey and three-story stone houses, built along these streets have been furnished to improved sanitation and water supply with hot and cold water ... In the workshops of the city employed hundreds of skilled artisans. Both cities have traded with Egypt, Crete and Mesopotamia. Nearly two millennia before our era, both the city mysteriously disappeared. Several hundred years in a row, scientists puzzled, trying to solve this riddle. Put forward the most fantastic hypotheses. There were even suggestions that the city died in a nuclear holocaust because of inept handling of nuclear material. Anticipated an invasion of aggressive aliens. Argued that the cities were destroyed by a huge meteorite. There were other suggestions. But the real reason, as it turned out, was another. At the city hit just two elements - an earthquake and flood. Earthquake rearing ground. The resulting mountains blocked the Indus. Water mighty river turn back on the flowering of the city flooded. Then began an offensive mud flows. Villages around Mohenjo-Daro were buried under the multimeter layer of sand and silt. Citizens trying to save his city began to build the dam. But the surging water and mud is constantly increasing. To deal with them was getting harder and harder. The city flooded five times. But residents with enviable persistence erected to pump sand and silt a new city: it can be seen on buildings unearthed. The onset of the mud of the sea lasted about one hundred years. Hunger and disease forced the residents of Mohen-jo-daro to leave their city. That's a force of nature has destroyed one of the centers of human culture in the ancient world.