Much of alaska is covered by
a. forests of giant redwoods
b. valuable uranium deposits
c. the rocky mountains and the sierra nevada
d. the alaska range and the brooks range

How do convection currents form underwater mountains?

Amountain is larger than a hill, with steep sides true or false

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.