Write down in your journal where you find rocks and what they are like. Check in a guide book to make sure you have all the names of the rocks. There is always rock under us. The skin of the earth is called the crust and it varies from 5 to 20 miles deep. This crust is made up of three kinds of rock.
Rocks are masses of mineral matter and can be all different sizes.
Igneous rocks are formed when melted rock inside the earth hardens. Sedimentary rocks are developed from material that collected and hardened as the earth was worn away by wind and water. This rock has many pieces of other things in it, like shells and bones. Metamorphic rocks developed from a combination of igneous and sedimentary rock. Pressure, heat and chemical changes combined to make the metamorphic rock.