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Active and Passive Margins. Not always a plain sea mounts guyots ( gee -ohs) ridges and trenches. Deep-Sea Floor. Hydrothermal Vents. Hydrothermal Vents. Composition of Sea Water. Weathering and Vents. Temperature. Temperature. Reds and oranges within first 10 m
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Not always a plain sea mounts guyots (gee-ohs) ridges and trenches Deep-Sea Floor
Reds and oranges within first 10 m Photosynthesis not possible beyond 200 m (usually much less) No light beyond 1000m Transparency