Igneous rocks form out of cooling lava or magma ... In this article, we'll list 30 types of rock with pictures and a brief description to help you identify them.

Igneous intrusions are a type of rock feature. They form when molten rock cools below the surface of the Earth. Join Isla and Connor as they explore igneous rock landscape features at Traprain Law ...

The photo was taken by Nathaniel H ... The rock composing the Devil’s Tower is phonolite porphyry, a rare igneous rock that contains large, well-formed crystals embedded in a fine-grained ...