How do the waves of sound travel on the night that produces the temperature inversion, and why? The waves bend toward the ground because it is warmer above and colder lower below, and waves travel more slowly through the colder air. The waves travel in a straight line because waves always travel in a straight line. The waves bend toward the sky because it is warmer above and colder lower below, and waves travel faster through the colder air. The waves bend toward the sky because it is colder above and warmer lower below, and waves travel faster through the warmer air