In order for a hurricane to form, how deep must the surface layer of warm ocean water extend to?
A. 40 metres
B. 200 metres
C. 20 metres
D. 400 metres
Answer: C
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Although traditional agriculture is common in many parts of the world, the United States primarily uses ____________________ agriculture for food production.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not part of the water cycle?
A) water evaporating from a lake B) calcium carbonate dissolving in soil water and groundwater C) water moving into creeks and streams following a rainstorm D) water infiltrating into the soil and bedrock
In the diagram below, B is the
A) hadal zone.
B) mesopelagic zone.
C) epipelagic zone.
D) benthic zone.
Why is Russia's population declining?
A. There is a one-child policy similar to the one in China and Thailand B. Russia's population is not declining C. The standard of living has decreased leading to lower infant mortality and lower birth rates D. The standard of living has decreased leading to higher death rates and lower birth rates E. There has been a massive education campaign to reduce births