In Understanding Our Environment, read pages 115-116 and answer question 2 of "Looking Back", question 3 of "Applying Your Knowledge", and question 1 of “Extending Your Thinking” on pages 133 and 134
In Understanding Our Environment, read pages 138-142 and 146-150 and answer questions 4 and 5 of "Looking Back" and questions 1, 4, and 7 of "Applying Your Knowledge" on pages 153 and 154.