It takes a lot of things to make cookies - flour, milk, eggs, butter, sugar. But when the cookies are baked, you can't see that there are a lot of things in them. Everything is all mixed together.
A rock is like a cooky. Mixed into most rocks are things that you can't see. Rocks are mixtures of materials called minerals.
Minerals are the solid stuff that the earth is made of. There are about two thousand different kinds of minerals. Some are shiny, some are sparkly, some are dull. Some are hard enough to scratch glass. Others are so soft you can scratch them with your fingernail. There are minerals that look like chunks of ice, minerals that look like clusters of metal cubes, and minerals that look like bunches of fuzzy string or shiny hair.
Minerals are scattered throughout the earth's rocky crust. Many of them are mixed together, but many are by themselves, in huge chunks, little lumps, and broad patches between layers of rock.
A rock is like a cooky. Mixed into most rocks are things that you can't see. Rocks are mixtures of materials called minerals.
Minerals are the solid stuff that the earth is made of. There are about two thousand different kinds of minerals. Some are shiny, some are sparkly, some are dull. Some are hard enough to scratch glass. Others are so soft you can scratch them with your fingernail. There are minerals that look like chunks of ice, minerals that look like clusters of metal cubes, and minerals that look like bunches of fuzzy string or shiny hair.
Minerals are scattered throughout the earth's rocky crust. Many of them are mixed together, but many are by themselves, in huge chunks, little lumps, and broad patches between layers of rock.
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