Save guides, add subjects and pick up where you left off with your BBC account. For example, the rock malachite is mostly made of the compound copper carbonate which has the formula CuCO₃.

Pumice is an example of extrusive igneous rock. The word extrusive means that the magma was forced onto the earth's surface and cooled in a matter of hours. Granite is an example of intrusive ...

This is a beginner's guide to identifying UK rock types. The guide has two main sections: background information on the structure and forces affecting the Earth in relation to rock formation a more ...