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abundant accumulation amount areas asthenosphere atoms basaltic basins beds beneath calcium called carbon cause cent channel chemical clay color composed composition continental continents Courtesy of U.S. crust crystals debris density deposits depth develop dioxide dolostone earth's surface earthquake electrons eroded erosion eruptions example fault feldspar Figure floodplains flow folded formation fossils geologists glacial glaciers grains granite gravity groundwater hornblende igneous rocks ions iron Lake lava layers limestone lithosphere located magma magnesium magnetic mantle marine mass wasting melting ment metamorphic rocks meters mica mid-oceanic ridges minerals mountain move movement occur ocean floor olivine origin oxygen particles plagioclase plane plants plate tectonics pressure quartz regions relatively result ridges River S-waves sand sandstone sea floor sea level sediment sedimentary rocks seismic shale silicate slope soil strata stream structure subduction temperature texture tion U.S. Geological Survey uranium valley velocity volcanoes water table waves weathering wind zone