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A Giant Machine
An Overview of Physical Geology
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acid asthenosphere Astrogeology Astrogeology Box atoms basalt basin beach bed rock beneath boundary box figure C. C. Plummer calcite Canyon carbon caused channel chapter chemical weathering clay minerals cliffs climate composition continental crust continents craters crystal debris deposited depth desert dunes earth's surface earthquakes eroded erosion eruptions fault feldspar fine-grained flood folds fossils fracture geologists glacial glacier grains granite gravity ground water heat horizontal ice sheet igneous rocks ions kilometers lake land surface lava flows layers limestone lithosphere mafic magma magnetic mantle mass wasting material melting metamorphic rocks meteorites meters mid-oceanic ridge mountain ranges moving occur oceanic crust particles Photo by C. C. plate tectonics plutonic pressure quake quartz regions river sand sandstone sea floor sea level sediment sedimentary rock seismic waves shale silica silt slope soil solidified stream structure subduction temperature thick U.S. Geological Survey usually valley velocity volcanic water table wind zone