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accumulation areas asthenosphere atoms basaltic base level basins beach bedrock called carbon cause channel chemical weathering coast common composed composition contain continental Courtesy crater created crystals debris deformed deposits depth desert dunes E. J. Tarbuck earth earthquake electrons environment erode erosion eruption example fault feldspar Figure fossil fractures gases geologic time scale geologists glacial glacier grains granite groundwater igneous rocks ions island kilometers lake land layer limestone lithosphere located magma mantle mass wasting material melting ment metamorphic rocks meters million moraine mountain building move movement occur oceanic crust particles percent Photo by E. J. planet plate tectonics portion pressure produced quartz radiometric dating regions relatively result ridge river sand sea level sediment sedimentary rocks seismic shale shoreline silicate minerals slope soil stream structure subduction temperatures thick tion ture U.S. Geological Survey valley velocity volcanic activity water table waves wind zone