Why it is cooler in northern california than it is in north carolina

Most of earths fresh surface water is found in

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Which measure of humidity, relative humidity or dew point, best describes the actual quantity of water vapor in a mass of air