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Contents Earth's natural cycles 4 Rocks 6 The rock cycle 8 Volcanic rock 10 Sand and sediment 12 Sedimentary rock 14 Metamorphic rock 16 Soil 18 The balance of nature 20 Human activities 24 Using rocks and soils wisely 26 Ideas and tips Saving rocks and soils 28 Living with nature 30 Glossary 31 Index 32
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