Rocks... the hardest objects on earth. Yet, they were designed to be the foundational element on earth... the building blocks of earth. Rocks give us metal, building materials, and other useful things. Other rocks are beautiful and are crafted into costly jewelry and beautiful objects of art. There are many different types of rocks, but here are a few.
1) Igneous rocks are usually rocks that are formed from magma. These are hot rocks! There are two types of this kind of rocks extrusive igneous which are formed when magma is forced out of a volcano, and intrusive igneous which are formed while the magma cools underground.
2) Sedimentary rocks are formed by a layer of sand and minerals that were laid down by water and pressed together to form rocks. You see these layers often when you look at the side of an eroded mountain or even the Grand Canyon.
3)Metamorphic Rocks are formed by changing a rock from one type into a new kind of rock. Sometimes great heat or great pressure with transform rocks into other types of rock. Like the coal into a diamond.