Almost 14.5 billion years ago, it all started with a BIG BANG and what began as a cloud of gas, dust, and rock eventually took shape and bloomed into a molten sphere. Battered by asteroid collisions, ice ages, and shifting tectonic plates, our fledgling planet finally pushed forth continents. But if you think the earth has calmed down since then--think again Geological activity continues to sculpt the earth's landscape, sometimes with terrible consequences...