How are ocean waves different from sound waves?

What does the symbol (–hfus) indicate in a phase change?

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?

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.