5. Identify Give two features that are found only at plate boundaries, and two fea- tures that are found most commonly at plate boundaries.

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.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

Advantages and disadvantages of mitigation and adaptation