A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type of atom ... Chalk is a sedimentary rock. Metamorphic rocks are formed ...

Metamorphic rocks are the third main classification. These started out as other types of rock but were changed by high heat and pressure. In this article, we'll list 30 types of rock with pictures ...

The characteristics of the rocks that hold fossils can be as informative as the fossils themselves. There are three main types of rock: igneous rock, metamorphic rock, and sedimentary rock. Almost all ...

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 ...