How are tree rings used as proxy data to provide an indirect record of past climate conditions?
a. ?Tree rings are thicker and the wood is denser when growing conditions are better.
b. ?Tree rings are thicker and the wood is lighter when growing conditions are better.
c. ?Tree rings are thinner and the wood is denser when growing conditions are better.
d. ?Tree rings are thinner and the wood is lighter when growing conditions are better.
e. ?Because of variable moisture levels, tree rings cannot be used as proxy data.
ANSWER: a
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Handling wastes so that humans and the environment are protected is called waste __________.
Fill in the blank(s) with the appropriate word(s).
Cyclone
?
The following questions refer to the above illustration of a middle-latitude cyclone. The dashed lines show the positions of the fronts six hours ago.
At which location represented by the four positions on the map would you expect to hear the following 12-hour forecast: "Partly cloudy and continued warm through this afternoon and evening"?
A. position 1 B. position 2 C. position 3 D. position 4
Which of the following factors, responsible for large-scale temperature changes presently being experienced, has changed decisively due to human activity?
a. stratospheric volcanic sulfate aerosols b. climate variability c. solar radiation d. greenhouse gases e. snow-albedo effect
The initial stage of an ordinary thunderstorm is the?
a. ?mature stage. b. ?dissipating stage. c. ?cumulus stage. d. ?multicell stage. e. ?primary stage.