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 41
... magnetic anomaly A Fracture Increase Magnetic field strength Decrease X Surface Magnetite ( iron ore ) Surface ... anomalies can indicate hidden ore and geologic structures . A positive magnetic anomaly is a reading of magnetic field ...
... magnetic anomaly A Fracture Increase Magnetic field strength Decrease X Surface Magnetite ( iron ore ) Surface ... anomalies can indicate hidden ore and geologic structures . A positive magnetic anomaly is a reading of magnetic field ...
Page 78
... magnetic anomaly Rift valley at ridge crest Negative magnetic anomaly 2.0 2.5 3.0 B 10 Kilometers Figure 4.14 Marine magnetic anomalies . ( A ) The red line shows positive and negative magnetic anomalies as recorded by a magnetometer ...
... magnetic anomaly Rift valley at ridge crest Negative magnetic anomaly 2.0 2.5 3.0 B 10 Kilometers Figure 4.14 Marine magnetic anomalies . ( A ) The red line shows positive and negative magnetic anomalies as recorded by a magnetometer ...
Page 79
... magnetic anomalies with magnetic reversals allows anomalies to be dated . Magnetic anomalies can therefore be used to predict the age of the sea floor and to measure the rate of sea - floor spreading ( plate motion ) . Because magnetic ...
... magnetic anomalies with magnetic reversals allows anomalies to be dated . Magnetic anomalies can therefore be used to predict the age of the sea floor and to measure the rate of sea - floor spreading ( plate motion ) . Because magnetic ...
Contents
Chapter | 6 |
Box 8 | 8 |
Delivering Alaskan OilThe Environment vs the Economy | 10 |
Copyright | |
74 other sections not shown
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