1. a factor is one that makes people leave their homeland to seek out better-living conditions. question 1 options: a. proximity b. positive c. pull d. push a(n) resource is one that can be easily replenished. question 2 options: depleted oil non-renewable renewable

Which of the following is not a place where hydrogen can be found on earth? a. natural gas well b. atmosphere c. water d. mine

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 two nations are doing the most to combat their environmental issues?