Explain why crevasses only penetrate partway through a glacier. What limits their depth?
What will be an ideal response?
Below about 50 meters depth, the weight of the overlying ice causes it to begin to flow rather than fracture. The flowing ice seals off the tips of any fractures that reach that depth.
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A fault zone that is known for a lot of big and small earthquakes goes suddenly quiet for 10 years. This quiet period in an otherwise active fault zone is called a seismic gap. Explain why seismic gaps are pretty good indicators that an area may soon have a moderate or large earthquake. (Hint: Think of strain in rocks.)
What will be an ideal response?
In analyzing continental drift, the name given to the northern supercontinent was ____
a. Laurasia b. Laurentia
c. Baltica d. Gondwana e. northern Pangaea
While following an Ekman spiral, ocean currents will have turned about this many degrees upon reaching a depth of approximately 100 meters: ________
What will be an ideal response?
Gravity is measured by the gal, which has the dimensions of:
a. distance b. weight c. force d. acceleration