In Understanding Our Environment, read pages 123-130 and answer question 5 of "Looking Back", questions 4, 7, and 8 of "Applying Your Knowledge", and questions 4 and 5 of “Extending Your Thinking” on pages 133 and 134.
In Understanding Our Environment, read pages 90-92 and 100-101 and answer question 1 of "Looking Back" and questions 1 and 4 of “Extending Your Thinking” on page 113.