All the water on Earth forms the: a. Lithosphere
b. Geosphere
c. Hydrosphere
d. Atmosphere

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.

Solve the equation.8 - 2x = -8х + 14

The process by which liquid water changes into water vapour is called what ?