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 76
... crest . This basalt is then carried sideways by convection and is subducted into the mantle at an oceanic trench . Thus old sea floor is continually being destroyed at trenches , while new sea floor is being formed at the ridge crest ...
... crest . This basalt is then carried sideways by convection and is subducted into the mantle at an oceanic trench . Thus old sea floor is continually being destroyed at trenches , while new sea floor is being formed at the ridge crest ...
Page 78
... crest Age ( millions of years ago ) Normal magnetism 0.5 1.0 -Reverse magnetism 1.5 Oceanic crust A Positive magnetic anomaly Rift valley at ridge crest Negative magnetic anomaly 2.0 2.5 3.0 B 10 Kilometers Figure 4.14 Marine magnetic ...
... crest Age ( millions of years ago ) Normal magnetism 0.5 1.0 -Reverse magnetism 1.5 Oceanic crust A Positive magnetic anomaly Rift valley at ridge crest Negative magnetic anomaly 2.0 2.5 3.0 B 10 Kilometers Figure 4.14 Marine magnetic ...
Page 79
... crest Region of normally Rift valley at ridge crest Age ( millions of years ago ) magnetized dikes 1 4 3 2 2 3 4 Magma 1 cm / yr 1 cm / yr Upper mantle 10 Kilometers A Time of normal magnetism Normally magnetized dikes Figure 4.17 ...
... crest Region of normally Rift valley at ridge crest Age ( millions of years ago ) magnetized dikes 1 4 3 2 2 3 4 Magma 1 cm / yr 1 cm / yr Upper mantle 10 Kilometers A Time of normal magnetism Normally magnetized dikes Figure 4.17 ...
Contents
Chapter | 6 |
Box 8 | 8 |
Delivering Alaskan OilThe Environment vs the Economy | 10 |
Copyright | |
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Common terms and phrases
abyssal plains andesite asthenosphere atoms basalt basin beds beneath Benioff zone California Canyon caused chapter chemical weathering composition continental crust continental rise continental slope continents convection converging boundary cooling core craton crystal deep deposited depth dikes diverging boundary drilling earth's crust earth's surface earthquakes erosion eruptions feldspar folds fossils fracture zones gabbro geologists granite gravity heat flow horizontal hot mantle igneous rock isostatic kilometers lava flows lithosphere mafic magma magnetic anomalies mantle rock melting metamorphic rocks meteorites meters mid-oceanic ridge million mountain belt mountain ranges move normal faults occur oceanic crust oceanic trenches Photo plate boundaries plate motion plate tectonics plutonic pressure quake quartz reef regions ridge crest rift valley San Andreas fault sandstone sea floor sea level sediment sedimentary rock seismic waves shale shown in figure silicate soil solidified stress structure subducting plate temperature terrane thick turbidity currents U.S. Geological Survey uplift volcanoes