Energy output divided by energy input is known as the ____.
A. net energy
B. energy returned on investment
C. energy quality
D. energy density
E. subsidy
Answer: B
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Which is a natural source of air pollutants?
A. a volcanic eruption in Alaska B. a new Toyota Prius (hybrid car) C. a campfire in your backyard D. a refrigerator that runs on natural gas
The 1992 Earth Summit was concerned primarily with this type of issue
A) population growth B) the status of women C) water pollution D) global environmental issues
If the Earth was in a cooling trend, which of the following processes would most likely act as a positive feedback mechanism?
A. increasing the snow cover around the Earth B. increasing the water vapour content of the air C. decreasing the amount of cloud cover around the Earth D. increasing the carbon dioxide content of the air
How are snowflakes able to fall in air temperatures that are above freezing?
What will be an ideal response?