Our Earth is about 4.5 billion years old and, through careful work, scientists have pieced together a timeline of its past.

Lavas from hotspots - -whether erupting in Hawaii, Samoa or Iceland -- likely originate from a worldwide, uniform reservoir in Earth's mantle, according to an evaluation of volcanic hotspots.

We know Mars once had an active geological past, filled with water, volcanic activity, and dynamic geological changes. Now, ...

A newly discovered doughnut shape in Earth's outer core may reveal elements that help drive the formation of the planet's ...