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

Unusually small burrows, i.e., tiny tubes that run through the rock in a parallel arrangement from top to bottom, were discovered in marble and limestone of these desert regions. The paper is ...

The basalt which makes up the Giant’s causeway is an igneous ... Metamorphic rocks are formed when another rock is under heat and pressure. Marble is a metamorphic rock, it is highly decorative ...