The Maunder minimum or "Little Ice Age" of the late seventeenth century is believed to have been caused by:

A. a decrease in the concentration of greenhouse gases in the atmosphere
B. a period of very low sunspot activity
C. a large volcanic eruption
D. greater global albedo due to heavy cloud cover in the Northern Hemisphere


Answer: B

Environmental & Atmospheric Sciences

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Which of the following explains why many household septic systems end up contaminating the shallow groundwater system?

A. all of the answers listed here B. drain field becomes plugged by solids leaving the septic tank C. residents pouring household chemicals down their drains D. water table is too high for the system to operate properly E. permeability of material beneath drain field is too low for proper drainage

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Predict how a change in the hydrologic cycle, such as increased rainfall in an area, might influence the biosphere and geosphere in that area.

Environmental & Atmospheric Sciences

France intervened in Mali's civil war in 2013. This is an example of:

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