During the day the sun heats up the earth's surface, warming the air close to the ground. ... The higher air is warmer than the air close to the ground. During the day the sound travels faster near the ground. This causes the sound wave to refract upwards.
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At night the ground cools quickly. The higher air is warmer than the air close to the ground. During the day the sound travels faster near the ground. ... The sound further from the ground travels faster at night causing the sound wave to refract back towards the earth.
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Answer:
During the day the sun heats up the earth's surface, warming the air close to the ground. ... The higher air is warmer than the air close to the ground. During the day the sound travels faster near the ground. This causes the sound wave to refract upwards.
Explanation: