. Imagine you are at a location of 170°E longitude on the equator. You want to go to a location on the equator at 10°W longitude. Is the most direct route
over the North Pole, over the South Pole, around the equator, or another
route? Explain your answer.

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.