Why the white dwarf is the least massive star?

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.

What type of coastline is commonly found along the western side of the america’s

The chemical or mechanical process by which rock is gradually broken down eventually becoming soil