LIZ BONNIN: Hi, I’m Liz Bonnin. When we think about plate tectonics, we normally picture erupting volcanos, gigantic mountain ranges like the Himalayas, or terrifying tsunamis and earthquakes ...

Emerging evidence suggests that plate tectonics, or the recycling of Earth's crust, may have begun much earlier than ...

LIZ BONNIN: Hi, I’m Liz Bonnin and this next clip looks at plates and eggs. The plates are tectonic plates that make up the Earth’s crust and are constantly moving very, very slowly.

Four types of plate tectonic activity are demonstrated in this feature. Keep an eye on the map to see where in the world the activity takes place. Also known as spreading boundary, a divergent ...

Plate tectonics is the theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history. The theory explains the how and why behind mountains, volcanoes ...