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When drilling stopped in 1994, the hole was over 7 miles deep (12,262 meters),(572°F), that's pretty HOT! My question is that if that's the deepest humankind has gone, 7 miles deep & Earth has continental crust of 35-40km which is 21-24 miles thick (33,796 meters). How do we know Earth's insides, like how were told in the books & by the professors that there is a mantle & a core beneath Earth's crust when we haven't gone that deep? It is easy to go deep into space because it's empty, but going deep into Earth, theirs a lot of pressure.
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