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 233
... FELSIC Plagioclase feldspar Increasing silica Ferromagnesians BASALT INTERMEDIATE MAFIC 45 % SiO2 Figure 10.8 oxides ; si in felsic is for silica ) . Rhyolite , the most abundant vol- canic rock with a felsic composition , is light in ...
... FELSIC Plagioclase feldspar Increasing silica Ferromagnesians BASALT INTERMEDIATE MAFIC 45 % SiO2 Figure 10.8 oxides ; si in felsic is for silica ) . Rhyolite , the most abundant vol- canic rock with a felsic composition , is light in ...
Page 265
... felsic magma by partially melting more of the continental crust . The felsic magma , in turn , separates from its solid residue and works its way up- ward in diapirs to a higher level of the crust where it slowly solidifies to a pluton ...
... felsic magma by partially melting more of the continental crust . The felsic magma , in turn , separates from its solid residue and works its way up- ward in diapirs to a higher level of the crust where it slowly solidifies to a pluton ...
Page 266
... felsic magmas are generated at converging boundaries . Opinions change as scientists analyze and weigh a wide range of com- plex data . Some are now arguing that the asthenosphere does not exist beneath the continents ! If testing of ...
... felsic magmas are generated at converging boundaries . Opinions change as scientists analyze and weigh a wide range of com- plex data . Some are now arguing that the asthenosphere does not exist beneath the continents ! If testing of ...
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