When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Anjouan island, off eastern coast of Africa, is mostly made of dark volcanic rocks, like these ...

Marble is best known for what it can be made into — incredible artworks or tacky ashtrays. But before it was that prized white-grey rock, marble was something a lot more pedestrian — limestone. For ...

The Earth is not fond of tall mountains. In the world's steep mountain ranges, weathering and erosion (caused by wind, rain, ice, chemicals and rivers) work quickly to bring down tall summits.

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This object is part of the Education ...

Rock is a solid mass of minerals that have joined together over time. Geology is the study of how the Earth is formed and the things that happen to the Earth. As part of this, geologists study rocks ...

This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...