What are rocks

A rock is something hard and can be big and small too. Rocks can only be three types. They can be a metamorphic, igneous or sedimentary rock.

A rock is hard and a sedimentary rock can break easily. A metamorphic rock is very hard and an igneous rock has crystals in it and comes from volcanos as well. Sedimentary rocks can have layers. A metamorphic rock is really hard. An igneous rock comes from a volcano.

I think that rocks are very interesting and that it is fun to look at crystals. I also like to guess what types of rocks they are.