The geological events we see on the surface of the Earth as mountains, volcanoes and earthquakes are expressions of processes that are happening deep in our planet. Here on the Earth’s crust, we’re part of a conveyor belt system called plate tectonics where old crust at the margins of oceans are shoved back underground beneath continents, into the mantle.
Click here for original story, A surprisingly soft mineral may control how Earth recycles rocks
Source: Phys.org