Physical Geology: Earth RevealedCoverage of plate tectonics is moved to the beginning of the book. The text is also used as the official Annenberg CPB distributed telecourse for physical geology.The beautiful new art program and interactive writing style will grab students' attention and further their interest in the subject. |
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Page 236
... volcanic breccia is a rock that includes larger pieces of volcanic rock ( blocks , bombs ) . Pyroclasts , the fragments formed by volcanic explosion , can be almost any size . Dust and ash are the finest particles ; cinders are about ...
... volcanic breccia is a rock that includes larger pieces of volcanic rock ( blocks , bombs ) . Pyroclasts , the fragments formed by volcanic explosion , can be almost any size . Dust and ash are the finest particles ; cinders are about ...
Page 241
... volcanic domes are very high in silica ( felsic ) . They solidify as rhyolite or , less commonly , andesite if minerals crys- tallize , or as obsidian ( volcanic glass ) if no minerals crystallize . Because the thick , pasty lava that ...
... volcanic domes are very high in silica ( felsic ) . They solidify as rhyolite or , less commonly , andesite if minerals crys- tallize , or as obsidian ( volcanic glass ) if no minerals crystallize . Because the thick , pasty lava that ...
Page 245
... volcanic breccia 236 volcanic dome 240 volcanism 228 magma 228 Mediterranean belt 240 volcano 228 QUESTIONS FOR REVIEW 1. Compare the hazards of lava flows to pyroclastic flows . 2. What roles do gases play in volcanism ? 232 3. What do ...
... volcanic breccia 236 volcanic dome 240 volcanism 228 magma 228 Mediterranean belt 240 volcano 228 QUESTIONS FOR REVIEW 1. Compare the hazards of lava flows to pyroclastic flows . 2. What roles do gases play in volcanism ? 232 3. What do ...
Contents
Chapter | 6 |
Box 8 | 8 |
Delivering Alaskan OilThe Environment vs the Economy | 10 |
Copyright | |
73 other sections not shown
Common terms and phrases
active America anomalies atoms basalt becomes beds beneath block boundary break building California called caused chapter chemical composition continental continental crust continents cooling core crystal currents deep deposited depth described determine direction earth's magnetic field earth's surface earthquakes erosion eruptions evidence example explain fault field figure flow folds forces geologic geologists granite gravity heat horizontal igneous increase indicate island kilometers land lava layers less lines lithosphere lower magma magnetic mantle margin mass material melting metamorphic meters mid-oceanic ridge million minerals motion mountain belt move movement normal North occur oceanic crust original Photo plains plate tectonics poles position present pressure processes quake quartz range regions relatively ridge rise sea floor sediment sedimentary rock seismic seismic refraction shown slope soil South stress structure subduction surface temperature theory thick Trench United usually volcanoes waves weathering zone