Why is southern california so densely populated?

Which of the following is evidence to the past existence of glaciers?

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 can minerals crystallize from materials dissolved in water? check all that apply.