What 2 types of lines show elevation differences?
Choose 2
1. Quadrangle Lines

2. Intermediate Contour Lines

3. Index Contour Lines

South america is located within which hemisphere?

Why is terracing used in southeast asian agriculture?

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.