Question

which of the following is an effect of the low input of solar radiation at the poles throughout the year?
choose 1 answer:
a lack of solar heat increases evaporation, so the air holds more moisture.
b lack of solar heat limits evaporation, so the air is drier.
c lack of solar light limits evaporation, so the air is drier.
d lack of solar light increases evaporation, so the air holds more moisture.

Explanation:

Solar radiation provides heat. At the poles, low solar - radiation input means less heat. Heat is required for evaporation. Less heat limits evaporation. When evaporation is limited, there is less water vapor in the air, so the air is drier.

• Option A: Lack of solar heat would decrease, not increase evaporation. So, A is incorrect.
• Option B: As explained above, lack of solar heat (due to low solar - radiation input) limits evaporation, making the air drier. B is correct.
• Option C: It is the lack of solar heat (not light) that limits evaporation. Light is not the main factor in evaporation in this context. So, C is incorrect.
• Option D: Lack of solar light does not increase evaporation. Also, the logic of evaporation and moisture in the air is reversed. So, D is incorrect.

Answer:

B. Lack of solar heat limits evaporation, so the air is drier.