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

Glacial Till A slightly smaller "ball" of till was shaped by its journey down the stream bed, during which time it became armored by picking up several small rocks. Rocks Along the Stream Bed ...

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

Put simply, limestone is a type of rock that is formed by organisms ... on the ins and outs of these two materials. Read more ...

Mysterious micro-burrows in desert marble and limestone were probably made by microbes that lived millions of years ago. Exactly what kind of microbes bored into the rock remains unknown ...

Chalk, limestone, shale, and sandstone are all ... the processes by which the sediment is formed. For example, small pebbles of rock are rolled along a river-bed. 2 Deposition In deposition ...