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v PartC How does the direction of sound travel compare to the shapes of the sound waves? » View Available Hint(s) The sound travels in the opposite direction from the arc of the crests of the waves. The sound is at right angles to the waves. The sound travels in the same direction as the arc of the crests of the waves. Previous Answers v Correct v PartD How does the cooler air above the lake affect the movement of sound at night? » View Available Hint(s) Sound travels faster in cooler air. The cooler temperature above the water refracts the sound wave away from the ground and toward the sky. Because it is colder just above the surface and warmer higher above, the sound wave is refracted toward the ground. Previous Answers v Correct