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How Are Rocks Formed?


Rocks are constantly being made. It begins out as liquid rock called magma. This liquid rock is deep down in the earth. When the liquid rock comes to the surface of the earth, it cools and turns solid. Wind and Water also help to make rocks. There are three classes of rocks; the sedimentary rock, metamorphic rock, and igneous rock.  Rocks on the bottom of an ocean or lake are called sedimentary rocks. Pressure or heat can change the sedimentary rock to metamorphic rock. Liquid rock that cools becomes igneous rock. This is what happens when a volcano erupts, it surfaces and turns into a solid which is also known as igneous rock. The picture below shows where all three rocks are located in the earth. It also shows how rock can be formed into other rocks.



Click here to see people Rock Climbing!

Visit this website to find out more about how rocks are formed and to see more pictures of rocks!




 A Child’s First Library of Learning. Time-Life Books Science Starter. Alexandria, Virginia 1989