When a sound from a source is refracted away from the surface of the earth, it gives an indication that the
a. wind is blowing in the direction of the sound.
b. ground is cooling faster than the air.
c. air is cooler than the ground.
d. air has high humidity.

when a sound from a source is refracted a way from the surface of the earth, it gives an indication that the : c. air is cooler than the ground The sound wave's speed is heavily relied on mediums that spread across the air, and these mediums are really sensitive and easily responded to change in temperature