Which of the following countries has the greatest tar sand deposits?
a. Saudi Arabia
b. Canada
c. Venezuela
d. Kuwait
e. United States
B
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Geosynchronous satellites that always appear at the same place in the sky are
A. beyond the pull of Earth's gravitational field. B. moving at a speed just short of escape velocity. C. stationary in space. D. orbiting Earth with a 24-hour period.
How do dunes build their characteristic asymmetrical profile? What will be an ideal response?
In the early twentieth century, what was the prevailing view among scientists of how land animals were able to travel from one continent to another?
a. Land animals that traveled between continents were also capable of swimming. b. Land animals that moved from continent to continent did so by hopping on stepping stones across the ocean. c. All continents had been connected together as a supercontinent. d. Some type of land connection allowed land animals to reach other continents. e. Land animals that moved from continent to continent did so by rafting on materials across the ocean.
A decrease in the levels of ozone in the ozone layer:
a. may be related to human use of chlorofluorocarbons. b. is not a cause for concern to humans because the ozone layer is in the stratosphere. c. cannot possibly be related to any human activities. d. is completely unrelated to the incidence of skin cancers in humans.