The runoff channels on Mars were most likely formed by:
A) melting underground ice.
B) catastrophic, but rare flooding.
C) the annual melting of the polar ice caps.
D) glaciers.
E) rain that was part of a water cycle.
B
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On a clear night when an observer in Los Angeles sees a first quarter Moon an observer in London would see
a. a full moon. b. a first quarter moon. c. a new moon. d. a third quarter moon. e. any of the above, depends on the time
Suppose Earth were to cool down a little. How would the carbon dioxide cycle tend to restore temperatures to normal?
A) Cooler temperatures cause volcanoes to become more active, so they release more carbon dioxide into the atmosphere than they do when temperatures are warmer. B) Cooler temperatures allow carbon dioxide to form rain and rain out of the atmosphere. C) Cooler temperatures mean more ice and more erosion, which somehow makes the planet warm up. D) Cooler temperatures lead to slower formation of carbonate minerals in the ocean, so carbon dioxide released by volcanism builds up in the atmosphere and strengthens the greenhouse effect.
When ice melts, its temperature increases
a. True b. False Indicate whether the statement is true or false
The three principal types of mountain building are fold, fault-block, and ______________
Fill in the blank(s) with correct word