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 232
... mafic - silica - deficient igneous rocks with a relatively high content of magnesium , iron , and calcium . ( The term mafic comes from magnesium and ferric . ) The most common mafic extrusive rock is basalt , which is dark in color . Mafic ...
... mafic - silica - deficient igneous rocks with a relatively high content of magnesium , iron , and calcium . ( The term mafic comes from magnesium and ferric . ) The most common mafic extrusive rock is basalt , which is dark in color . Mafic ...
Page 262
... mafic . Even in large sills , however , differentiation has rarely progressed far enough to produce any granite within the sill . If we assume that the mafic minerals settle ever deeper in large magma bodies , there is still a problem ...
... mafic . Even in large sills , however , differentiation has rarely progressed far enough to produce any granite within the sill . If we assume that the mafic minerals settle ever deeper in large magma bodies , there is still a problem ...
Page 265
... Mafic magma entering fissures D A Figure 11.23 Mafic magma B Continental crust Heating of lower crust and partial melting Underplating by mafic magma Mantle ( lithosphere ) Asthenosphere May way through fissures systems in the lower ...
... Mafic magma entering fissures D A Figure 11.23 Mafic magma B Continental crust Heating of lower crust and partial melting Underplating by mafic magma Mantle ( lithosphere ) Asthenosphere May way through fissures systems in the lower ...
Contents
Chapter | 6 |
Box 8 | 8 |
Delivering Alaskan OilThe Environment vs the Economy | 10 |
Copyright | |
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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