Which of the following gives the air temperature at 2000 metres above the ground when the environmental lapse rate is 5°C per 1000 metres and the temperature at the Earth's surface is 25°C?
A. 20°C
B. 30°C
C. 25°C
D. 15°C
Answer: D
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____________________. Fill in the blank(s) with the appropriate word(s).
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