Beneath the Surface: Ocean's Horizontal Layers, The
The area beneath the surface of the ocean is laid out in discrete zones and layers. These provide a convenient framework within which to analyze ocean structure.
Subject: trench
Transcript: as the "hadolpelagic"-- Or the hadopelagic zone, in only the very deepest parts Of the ocean. This would be submarine trenches, A place like the
Isostasy
Geophysicist and geologist Tanya Atwater discusses isostasy, which allows objects at the surface of Earth to float in equilibrium, and talks about how it helps define Earth's topography.
Subject: trenches
Transcript: plates are so heavy they're actually being Pulled into the earth by their own weight. And right at the top there's a big trench there, those are The
World in Motion: Seamounts, Guyots and Island Arcs
seamounts almost always found paralleling the concave edge of a trench.
Subject: trench
Transcript: trench At the aleutian trench. [narrator:] the island arc is a curving chain of volcanic islands and seamounts almost always found paralleling the concave