Why does the population of foreigners outnumber citizens in some countries on the arabian peninsula?

What is the earth matial ot igneous rock

The african continent is home of the worlds largest desert and longest river . t or f

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.