The alternating reversals of Earth's magnetic field throughout history have been recorded in sea floor rocks in a particular pattern and chronology. How does this support plate tectonics?
a) This does not support plate tectonics.
b) The pattern of alternating reversals indicates sea floor spreading and, as a result, continental drift.
c) The pattern of alternating reversals indicates that the sea floor is static, so there must be another mechanism for plate movement.
d) The pattern of alternating reversal indicates that the sea level has risen due to plate subduction.
B
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In the accompanying hydrograph for a major river, a flood was caused by a single episode of heavy rainfall 50 kilometers upstream. When did the rain most likely occur?
A) At time A
B) At time B
C) At time C
D) At time D
If the temperature drops and the amount of moisture in the air remains unchanged, the
relative humidity will increase. Indicate whether the statement is true or false
In Appalachia, many miners are out of work because ________
A) coal extraction has decreased because the region is beginning to run out of coal B) they were fired for protesting mountaintop removal C) mountaintop removal is highly mechanized, and thus they are not needed D) of local protests that shut down mining operations E) of a moratorium on mountaintop removal
What type of volcano is short-lived, relatively small, and is commonly on the flanks of other volcanoes?
A. Caldera B. Shield C. Dome D. Cinder cone E. Composite