Arecent development that threatens nigeria’s unity is a division between

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

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 is true of all geographic locations on earth?