Test Review Weathering, Erosion, Deposition, and Soil Formation Key Unit Questions: What causes mechanical weathering? What causes chemical weathering? What determines how fast weathering occurs? How does soil form? What is soil made of? What are the roles of plants and animals in soil formation? Why is soil one of Earth’s most valuable resources? How have human activities harmed the soil and how can human activities help save the soil? What processes wear down and build up Earth’s surface? What process is mainly responsible for shaping Earth’s land surface? What features are formed by water erosion? What features are formed when rivers and streams deposit sediment? How does sediment enter rivers and streams? How do glaciers cause erosion and deposition? How do waves shape a coast? How does wind cause erosion? How can catastrophic events affect Earth? How can human activities increase the impact of catastrophic events? Unit Vocabulary: Weathering Erosion Mechanical weathering Abrasion Chemical weathering Sediment Deposition Glacier Moraine Deflation Soil Bedrock Humus Loam Soil horizon Runoff Rill Plucking Sand dune Sod Renewable resource Inexhaustible resource Soil conservation Contour plowing Conservation plowing Gully Meander Oxbow lake Alluvial fan