In which of the following places are nomadic population patterns most likely to occur?
a. near industrial activity such as mining
b. around rivers and lakes
c. where agriculture is hard to sustain
d. on the indian subcontinent

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.

How many time zone are there on earth

Which season has the least amount of rain in the northern latitudes