A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type of atom ... s causeway is an igneous rock. Sedimentary rocks are formed ...

metamorphic and sedimentary rocks. Figure 1.1: Approximate mineral compositions of the more common types of igneous rocks, e.g. granite approximately 40% orthoclase, 33% quartz, 13% plagioclase, 9% ...

Sedimentary rocks close sedimentary rockSedimentary ... causing them to change into another type of rock. They are usually resistant to weathering and erosion and are therefore very hard-wearing.