Geologists discovered "gigantic fortresses" under the Earth's crust, which have provided insight into the workings of the ...

Halfway to the center of the Earth, at the boundary between the core and the mantle, lies a massive folded slab of rock that once formed the ocean floor and sank beneath North America some 50 million ...

But even with extra force from slab pull added into the equation, the models still didn’t quite fit Earth’s tectonics. Plates still moved faster than the models predicted. There must be other ...