'Seismic waves are used to know the interior structure of the earth' Explain.

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.

Wegeners theory of continental drift states that the continents have changed throughout history while the theory of plate tectonics

Name the three types of population distribution