Amineral that contains calcium carbonate will provide a positive response to a test for

Blank is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer

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.

Which of the following statements about the us federal boundaries is true