We often talk about climate change, melting glaciers, or strange landforms. But we rarely think about something that’s always ...

Lava rock and pea gravel are among the most popular types of landscaping rocks, followed by crushed granite, boulders, river rock, gravel, brick chips, marble rocks, and flagstone.

A rare rock from Mars known as Meteorite NWA 16788 will be up for auction at Sotheby's on July 16. The meteorite may sell for as much as $4 million, according to the auction house.