Giant regions of the mantle where seismic waves slow down may have formed from subducted ocean crust, a new study finds.

The deep oceans are far from flat. They feature ridges, trenches, seamounts, and valleys, creating a diverse and dramatic ...

Earth is made out of different layers, and those layers get hotter and more pressurized the deeper you go. The first layer is the crust, a thin outer shell that extends about 18 miles (30 km ...