S1: | We now know that the oceans are very deep. |
P : | For example, the Indian ocean has a range called the Indian Ridge. |
Q : | Much of it is fairly flat. |
R : | However, there are great mountain ranges as well. |
S : | On average the bottom is 2.5 miles to 3.5 miles down |
S6: | This reaches from the India to the Antarctic. |
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