Mysterious tunnels in desert rocks may be the work of unknown microbes, hinting at a hidden world inside marble and limestone ...

In the desert areas of Namibia, Oman, and Saudi Arabia, research work has revealed unusual structures that are probably due ...

Rocks typically range from 2 to 24 inches ... Made of durable natural stones such as granite, limestone, or basalt, cobblestone is sold in small blocks. Belgian blocks are a popular type of ...

Where limestone lies on top of an impermeable rock along a valley there can be several springs formed along the intersection of the two rocks. This is a spring line. The ice sheet which covered ...