Add Yahoo as a preferred source to see more of our stories on Google. Just as Earth’s land surface has enormous peaks and valleys, the oceanic world has similarly varied topography. Perhaps the most ...

Kathy Sullivan, an American geologist, has made history again. This past week, she became the first woman to reach Challenger Deep - that's the deepest point on the surface of the Earth. It's in the ...

(CNN) — Just as Earth’s land surface has enormous peaks and valleys, the oceanic world has similarly varied topography. Perhaps the most intriguing of these features is the Mariana Trench — a chasm in ...