How do sounds change?(2 points) Sound waves always get larger in size.

The pattern of sound waves change.

The sun causes sound waves to change.

Sound waves change to sound signs.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.