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All living things need air to survive. Air also protects the Earth. Discover why air is an importan..
Earth Materials Earth materials encompass the minerals, rocks, soil and water that constitute our p..
This concise, accessible, market-leading textbook brings together the wide-ranging fundamentals stu..
Erosion changes Earth's natural features. It breaks down materials and can help make something new...
Plants and animals from millions of years ago left behind fossils. Fossils can teach people about t..
Different kinds of rocks are found on Earth. Many are found deep inside Earth. Discover why rocks a..
Soil covers most of the land on Earth. It feeds plants and is home to many animals. Discover why so..
Most of Earth is covered in water. Water falls from the sky as rain or snow. All living things need..
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