Over two thousand years ago, the Greek writer Plato wrote about Atlantis, an island in the Atlantic Ocean. The island's people were very rich. They built a big city with many great buildings. At the center of the island, they built a beautiful golden temple. But the people became greedy - they had many things, but they still wanted more. So the gods became angry, and the island was struck by earthquakes and very large waves. Finally, the whole island sank the sea.