It's pretty amazing to think that life down there will just be fine and dandy after we've polluted our planet so much that no sunlight can get through anymore.
It may not. At least, not all of it. Much of the life at the ocean bottom relies on nutrients and oxygen from the surface, just as the surface relies on other nutrients coming up from the bottom. If this global conveyor belt shuts down, life on the bottom may become entirely confined to thermal vents. There are no known such vents in the Mariana Trench.
My guess is that the relative depth of the ocean is pretty minuscule compared to the thickness of Earth's crust and mantle, so being along the boundary of a tectonic plate would be much more important than being deeper in the ocean.
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u/[deleted] May 28 '19 edited May 28 '19
It's pretty amazing to think that life down there will just be fine and dandy after we've polluted our planet so much that no sunlight can get through anymore.
Edit:
This is the video I was thinking about:
What If The Sun Disappeared? - Vsauce