Glacially deposited strata were important in the development of continental drift theory because ____.
a. the distribution of glacial deposits indicated that the entire Earth must have been glaciated
b. the distribution of coal-swamp deposits indicated that the entire Earth must have been very warm
c. the glacial deposits indicated that there must have been many very large glaciers on several continents
d. the glacial deposits indicated that all of the southern continents must have been closer to the South Pole and contiguous
e. the glacial deposits indicated that climate can change dramatically over geologic time
d. the glacial deposits indicated that all of the southern continents must have been closer to the South Pole and contiguous
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Relative humidity is a measure of ________.
a. how much water vapor is in the air b. the ratio of water vapor in air to the amount of air c. the amount of water vapor in the air compared to some standard amount of water vapor d. the ratio of the water vapor in the air to the amount of water vapor that it would take to saturate the air e.None of these
What happens to high-quality matter in a low-waste economy?
A. It gets recycled and reused. B. It gets released to the environment as heat. C. It goes to a sanitary landfill. D. It ends up degrading in a natural wetland.
The oldest ocean floor is less than 200 million years old. Indicate whether the statement is true or false
In the United States, the worst drought--so far--was
A. the 1970s tragedy of over-withdrawal in aquifer system in southwestern regions B. in the 1930s when dry years and poor soil conservation resulted in the dust bowl C. in 1910, when the southwest received about 65% less rain than average