Astar's life is a battle between what two forces?

a. sun and moon

b. gravity and mass

c. gravity and thermal pressure

d. helium and carbon

On venus, which of the following drives geological change? a. hurricanes b. volcanoes c. tsunamis d. earthquakes

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.

Why is oman trying to develop its tourism and manufacturing sectors?