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Rocks and Minerals (World Discovery Science Readers)
Rocks and Minerals - World Discovery Science Readers Author:Kris Hirschmann Rocks and minerals have been around a long, long time. Our Earth's crust is covered by more than 3,500 different types of minerals. In some places, this crust of minerals is more than 40 miles thick! — Journey into the fascinating world of rocks and minerals. Learn about rare crystals and gems, and how we use rocks in our everyday lives. Disc... more »over how rocks are formed and how their formations tell us about the incredible forces that shaped Earth's surface long ago. Start your own collection of rocks and minerals - and uncover clues to Earth's past!« less