An air mass is a large pocket of air with
different temperatures
a uniform temperature but different humidity levels
a uniform temperature and humidity
different humidity levels

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.

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.

Democratic vs democratic whats the difference? ?