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 30
... asthenosphere slows down seismic waves . Velocity increases at 400 and 670 kilometers may be caused by mineral collapse . 2.2 In Greater Depth Mantle Xenoliths - A Peek at. 100 200 Velocity of P waves ( km / sec ) 6 8 10 Crust Depth 300 ...
... asthenosphere slows down seismic waves . Velocity increases at 400 and 670 kilometers may be caused by mineral collapse . 2.2 In Greater Depth Mantle Xenoliths - A Peek at. 100 200 Velocity of P waves ( km / sec ) 6 8 10 Crust Depth 300 ...
Page 77
... asthenosphere acts as a lubricating layer beneath the lithosphere . Oceanic lithosphere averages 70 kilometers thick ; continental lithosphere varies from 125 to 250 kilometers thick . Asthenosphere may not be present under continents ...
... asthenosphere acts as a lubricating layer beneath the lithosphere . Oceanic lithosphere averages 70 kilometers thick ; continental lithosphere varies from 125 to 250 kilometers thick . Asthenosphere may not be present under continents ...
Page 265
... Asthenosphere ( mantle ) Kilometers 0 100 Figure 11.22 Partial melting of felsic crust - " Dewatering " of the oceanic crust ; water triggers melting in asthenosphere . Melting of basalt Asthenosphere Magma chamber Fissures with magma ...
... Asthenosphere ( mantle ) Kilometers 0 100 Figure 11.22 Partial melting of felsic crust - " Dewatering " of the oceanic crust ; water triggers melting in asthenosphere . Melting of basalt Asthenosphere Magma chamber Fissures with magma ...
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