How are central america rivers and lakes important to the human systems of the area

Explain the cause for movement river valley civilization to early industrial centers

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.

Why is the study of demography important to geographers