Why is an understanding of Earth’s magnetic field important in the acceptance of the theory of plate tectonics??
What will be an ideal response?
ANSWER: It is known that Earth’s magnetic field changes its polarity, or direction, with a long recurrence interval due to changes in currents in its core. New rock formed at divergent boundaries like the Mid-Atlantic Ridge “records” the polarity of Earth’s magnetic field. Observations of the recorded magnetic field in ridges around the Mid-Atlantic Ridge show that the stripes of alternating polarity surround the ridge. The conclusion is that the stripes represent rock created during different epochs of the magnetic field, demonstrating that the ridge is an area where new rock is created.?
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The SO2 emissions displayed in this map derive mainly from the
A) automobile emissions from point sources.
B) automobile emissions from nonpoint sources.
C) burning of coal from point sources.
D) burning of coal from nonpoint sources.
In the Southern Hemisphere,
a. air rises steeply ahead of a warm front, and gradually ahead of a cold front. b. cold, warm and occluded fronts are associated with high pressure systems. c. precipitation associated with warm fronts tends to be brief and intense. d. precipitation associated with warm fronts tends to be gentle and prolonged
According to Homer Hoyt's sector model, once a district with high-class housing is established, the most expensive new housing is built
A) on the outer edge of that district, farther out from the center. B) on the inner edge of that district, closer to the center. C) in the skyscrapers of the CBD. D) in old industrial buildings and retail shops. E) on the outer edge of the suburban area, farther out from the center.
The San Andreas Fault has different behaviors along its length.
Answer the following statement true (T) or false (F)