Question

what is at the bottom of the ocean under all the sand

Answer 1

Answer:

In the deepest parts of the ocean, you'll find layers of Earth's crust make up the ocean floor. These deepest layers are made up of rock and minerals. Unlike the soft sands along the shoreline, these deep layers of thick rock and minerals do a fine job of holding the water in the world's oceans.

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Answer 2

Answer:

You see, the oceans are full of muck. Over time this muck settles out of the water and goes down to the bottom. It's basically mud. Sand is formed by the crushing of rock.