How do volcanoes cause continental drift?

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.

In what way does renewable energy differ form nonrenewable energy?

What is the climate of the himalayas? a. cold and wet c. cold and dry b. hot and humid d. hot and dry