What is greenhouse effect??

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.

Alow-pressure belt means the air is cold and dry warm and rising cold and sinking warm and moist

What are two ways besides voting that citizens may participate in government?