What is the basic reason why condensation is not very important in causing a cloud droplet to grow to raindrop size?
A) There are too many droplets competing for the available water vapor.
B) Electrical effects limit condensation.
C) Not enough condensation nuclei are present.
D) The question is incorrect; condensation is very important.
A
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Between 1960 and 2010, the total amount of recycled MSW in the U.S. has
A) actually declined by about 10%, a very disappointing trend. B) stayed about the same, as the cost of natural resources had declined. C) actually doubled, representing significant improvement. D) increased by more than 500%, representing a huge improvement.
?Land-based glaciers in Greenland and other parts of the world are slowly melting, and sea levels are rising.
Answer the following statement true (T) or false (F)
Which of the following is the best example of a positive feedback effect?
a. ?Melting ice exposes the dark surface of the ocean, which reflects less of the sun’s energy than ice. This heats the water and in turn, melts more ice. b. ?Melting ice exposes the dark surface of the ocean, which reflects more of the sun’s energy than ice. This heats the water and in turn, melts more ice. c. ?Melting ice allows ocean levels to rise and reduce the surface area of the remaining ice, slowing its melting rate. d. ?Aerosols block the sun’s radiation, slowing the melting of ice. e. ?Aerosols cause air pollution, which increases local drought conditions.
A lightning flash consisting of many strokes usually lasts less than ____ second
a. one b. three c. five d. seven e. nine