The ground beneath us is made up of lots of different types of rock.
Every hill, mountain and even under the sea is made entirely of rocks. In some places we can see the rocks, but most of the time the rocks are buried under grass, roads and buildings. When we dig into the ground to make quarries and mines we will always dig through different layers of rock.
What are Rocks made of?
A rock is made of lots of grains which glue together. The grains are made from minerals, which are a type of chemical compound or element that occur naturally. Rocks can be different colours, shapes and sizes but they are always made up of minerals.