A layer of charged particles, called the ionosphere, surrounds Earth, extending from about 50 to 400 miles above the surface of the planet. Disclaimer: AAAS and EurekAlert! are not responsible for ...

Seismic mapping of North America has revealed that an ancient slab of crust buried beneath the Midwest is causing the crust ...

In this diagram, the red lines represent ... The mantle is a semi-solid layer below the crust. There are no elements in this part of the Earth's structure that can be easily extracted.

Earthquakes. A short video for 11-14 year old pupils, exploring tectonic activity and earthquakes and featuring case studies ...