A snowball that rolls down a hill, gradually gaining more and more mass and rolling faster and faster as it continues, would be an example of a(n)
A. positive feedback system.
B. negative feedback system.
C. closed system.
D. open system.
Answer: A
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Discuss the importance and impact of the Yangtze and Yellow rivers in China, including both their positive and negative aspects. How has the Three Gorges Dam altered the Yangtze River?
What will be an ideal response?
Smog is responsible for which of the following?
a) An estimated 50,000–180,000 premature deaths in the U.S. annually. b) A global reduction in agricultural productivity. c) Extensive damage to forests. d) All of the above.
The United States leads the world in per capita carbon dioxide (CO2 ) emissions
Indicate whether the statement is true or false
A rock avalanche begins its downslope journey ________.
A. as bedrock B. near the top of a volcano C. as a result of a snow or ice avalanche D. due to the undercutting of a slope E. as a result of an earthquake