BBC - Earth: The Power of the Planet (2007) Part 4 Oceans

“Earth: The Power of the Planet” highlights the major events which have shaped the Earth's history and allowed life to flourish. Presented by Dr Iain Stewart, each episode will reveal a different force critical to the development of Earth including volcanoes, the ocean, the atmosphere and ice. The series follows Dr Stewart's personal journey to some of the most remote places on the planet, from abseiling down into a lava lake in Ethiopia to cave diving in the underwater caverns left by the impact of the meteorite that wiped out the dinosaurs. He will discover how volcanoes saved the planet, how a rainstorm lasted for thousands of years, and how the Mediterranean Sea once dried up. Each individual film highlights the delicate balance of life on Earth, and how its incredible history has been the story of disaster and recovery.

Part 4: Oceans

Earth’s oceans help make our planet different from every other planet in the solar system. As far as we know, no other place is the right temp for liquid water, the most essential ingredient for life to exist. The oceans are Earth’s primary stabilizing force, and their immense power helps to shape the appearance and behavior of the entire planet and everything living on it. And they are also the planet's great unknown - their deepest points have been visited less than the surface of the moon.

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