This in-depth look at Earth's oceans traces their origins; examines the effect of global warming; and the destruction the waters can wreak on land. Also: an exploration of the Great Barrier Reef; the Mid-Ocean Ridge; and the "Lost City."
A look inside Earth's core to examine the creation and destruction of the planet's surface. Also: geological phenomena around the world are spotlighted, including Hawaii's Kilauea volcano; Yellowstone's super-volcano; Mt. Everest; hot springs in Iceland.