Organic matter also called humus make up what percent of soil

Rocks that contain crystals that are roughly equal in size and can be identified with the unaided eye are said to exhibit a texture.

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 types of tourist are best to bring money to the local southeast asian communities