What is A Rock?

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What is a rock? We all know what rocks are right? They are lying on the ground everywhere!

Rocks and Minerals. What is a rock? A rock is made up of 2 or more minerals. All rocks are made of minerals. There are 3 types of rocks: –Sedimentary. - ppt download

Rocks CK-12 Foundation

Geological Features - City Of Rocks National Reserve (U.S. National Park Service)

Rocks and minerals - British Geological Survey

Sedimentary Rocks

6 Metamorphic Rocks – An Introduction to Geology