A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type of atom ... For example, the rock malachite is mostly made of the ...

According to their origin, rocks are divided into three groups, namely, the igneous, metamorphic and sedimentary rocks. Figure 1.1: Approximate mineral compositions of the more common types of igneous ...

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 ...