Spain and Portugal are taking a turn. The Iberian Peninsula sits on a boundary between two large tectonic plates that are ...

Learn about the movement of tectonic plates off the coast of northern California, a process that could incite major ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Earth's crust is the planet's outermost layer. It is made of solid rock and sits on top of ...

Earth's crust is the planet's outermost layer. It is made of solid rock and sits on top of another layer, called the mantle.