Light-colored ice and snow in polar regions cool the earth by reflecting incoming solar energy back into space. This process is called ____.
A. a tipping point
B. Milankovitch cycles
C. the albedo effect
D. the greenhouse effect
E. acidification
Answer: C
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If a rock is exposed to such high temperatures that it melts, it forms a(n) ____________________ and
becomes a(n) ____________________ rock. Fill in the blank(s) with the appropriate word(s).
Why do hanging valleys erode?
What will be an ideal response?
The use of biomass for cooking and heating is an important source of energy in many less developed countries. Which of the following is an issue related to this use of biomass?
A. It contributes to air pollution. B. It contributes to climate change. C. It uses up oxygen. D. All of the statements are correct.
The speed and direction of motion of an object is its ____________________
Fill in the blank(s) with correct word