A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type ... 2. Roof tiles Slate is formed from shale (a sedimentary rock).

metamorphic rock. Used for centuries and known for its extremely long lifespan, slate upgrades your home’s curb appeal. It’s ...

causing them to change into another type of rock. They are usually resistant to weathering and erosion and are therefore very hard-wearing. Examples of metamorphic rocks include marble ...