Which of the following is true of liquids? a. they have a definite shape. b. they have a relatively high density. c. they do not have a definite volume. d. they have the ability to diffuse through gases.

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.