Please, describe low-frequency vs. high-frequency waves.​

High-frequency sound waves are perceived as high-pitched sounds, while low-frequency sound waves are perceived as low-pitched sounds. The audible range of sound frequencies is between 20 and 20000 Hz, with greatest sensitivity to those frequencies that fall in the middle of this range.

Explanation: Obviously explained in the answer

reserve is the answer

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;