The hukou system in Communist China was used to
A. expand industrial production.
B. control air pollution.
C. limit migration to cities.
D. reduce population growth.
C. limit migration to cities.
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To detect trends in primary productivity related to climate change, scientists need ________ years of global data, such as can be obtained from ocean color satellites.
A. more than 100 B. 10 to 15 C. 30 to 50 D. 20 to 40
How much more energy is released when comparing a magnitude 6 to a magnitude 7 earthquake?
How much more energy is released when comparing a magnitude 6 to a magnitude 7 earthquake?
- About 30 times as much
- 10 times as much
- Twice as much
In the Northern Hemisphere, the Coriolis effect causes surface currents in the ocean to be deflected slightly ________ compared to the winds that cause them.
A) to the north B) to the left C) to the south D) to the right
Which of the following was common to the eruptions of Vesuvius and Mount St. Helens?
A) Both are composite volcanoes B) Earthquakes before the eruption C) Small eruptions of tephra D) Pyroclastic flows E) All of these are correct.