"http://yt.cl.nr/yxFazy_vDhE"
The ocean -- it is the most prominent feature on Earth, and of immeasurable importance to life on the planet. But what would it look like if all of the water was drained out of it? Mountains and valleys that dwarf Everest; shifting plates and undersea volcanoes; seams, ripples, and plains.
Tsunami: why and where they originate and propagate.
A trip through the Earth's history from its formation to the present tectonic motions causing earthquakes and tsunamis.