Chapter 1 THE ROCK CYCLE Rocks are everywhere on Earth They are at the bottoms of lakes and oceans They are in the soil They are even in our streets Where do all these rocks come from The Grand Canyon is a beautiful rock formation in Arizona What are some other places where you might find rocks
Most rocks are made of minerals Minerals are solid materials that do not come from plants or animals Rocks are usually made up of more than one kind of mineral AMETHYST IS A MINERAL THAT IS OFTEN USED IN JEWELRY
Rocks are constantly being created destroyed and created again This natural process is called the rock cycle It has been going on for billions of years THESE ROCKS IN SCOTLAND WERE FORMED MILLIONS OF YEARS AGO
Rocks are changed by weather erosion heat and pressure These forces destroy rocks But the rocks do not go away They just get broken apart or moved Destroyed rocks will become new rocks in different places Earth recycles its rocks Erosion is the gradual wearing away of a substance by wind water or ice Erosion caused these arches to form over millions of years
