The solar constant is
A. only about a quarter of all energy emitted by the sun.
B. the same value for all planets, even Neptune.
C. the same for a sphere or for a circle.
D. consistent amount of energy received at the top of the atmosphere.
Answer: D
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Most of the ionosphere is located in which of the following atmospheric layers?
A. mesosphere B. stratosphere C. troposphere D. thermosphere
The diagram below illustrates that after disturbance of the boreal forest, the pioneer and climax species are usually
A) deciduous and evergreen forest, respectively.
B) evergreen and deciduous forest, respectively.
C) deciduous forest and tundra, respectively.
D) tundra and evergreen forest, respectively.
Which of the following chemicals is implicated in both global warming and ozone depletion?
A. chlorofluorocarbons B. methane C. carbon dioxide D. sulfur dioxide
Which of the following is considered the most important driving factor for Plate Tectonics?
A) ridge push B) slab pull C) layer cake D) whole mantle