How underwater ridges and trenches are formed

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How underwater ridges and trenches are formed

Clip from How The Earth Was Made  |  Season 1  |  Episode 2  |  ABC  |  September 28, 2011
Classification: General Classification: General
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They are some the largest and deepest structures on our planet - but are invisible to us because they are under the sea. Find out how ocean ridges and trenches are formed.

They are some the largest and deepest structures on our planet - but are invisible to us because they are under the sea. Find out how ocean ridges and trenches are formed.

Community clip
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