7. 1 2 3 4 5

8. 1 2 3 4 5

10. 1 2 3 4 5

11. 1 Compare the composition and temperature of the atmosphere of Mars to the atmosphere of Earth. What are the major differences? 2 Why does Earth have oxygen in its atmosphere? How did it get there? 3 What are some chemical reactions that produce oxygen? Would any of them be better or worse suited to conduct on Mars? 4 How does the size (thickness) of Mars’s atmosphere compare to Earth? What issues could that difference cause for humans trying to land and live on Mars? 5 Could we change Mars’s atmosphere? This is called terraforming. How could we terraform Mars to make it more suitable for humans?

12. 1 Compare the composition and temperature of the atmosphere of Mars to the atmosphere of Earth. What are the major differences? 2 Why does Earth have oxygen in its atmosphere? How did it get there? 3 What are some chemical reactions that produce oxygen? Would any of them be better or worse suited to conduct on Mars? 4 How does the size (thickness) of Mars’s atmosphere compare to Earth? What issues could that difference cause for humans trying to land and live on Mars? 5 Could we change Mars’s atmosphere? This is called terraforming. How could we terraform Mars to make it more suitable for humans?

13. 1 Compare the composition and temperature of the atmosphere of Mars to the atmosphere of Earth. What are the major differences? 2 Why does Earth have oxygen in its atmosphere? How did it get there? 3 What are some chemical reactions that produce oxygen? Would any of them be better or worse suited to conduct on Mars? 4 How does the size (thickness) of Mars’s atmosphere compare to Earth? What issues could that difference cause for humans trying to land and live on Mars? 5 Could we change Mars’s atmosphere? This is called terraforming. How could we terraform Mars to make it more suitable for humans?

14. 1 Compare the composition and temperature of the atmosphere of Mars to the atmosphere of Earth. What are the major differences? 2 Why does Earth have oxygen in its atmosphere? How did it get there? 3 What are some chemical reactions that produce oxygen? Would any of them be better or worse suited to conduct on Mars? 4 How does the size (thickness) of Mars’s atmosphere compare to Earth? What issues could that difference cause for humans trying to land and live on Mars? 5 Could we change Mars’s atmosphere? This is called terraforming. How could we terraform Mars to make it more suitable for humans?

15. 1 Compare the composition and temperature of the atmosphere of Mars to the atmosphere of Earth. What are the major differences? 2 Why does Earth have oxygen in its atmosphere? How did it get there? 3 What are some chemical reactions that produce oxygen? Would any of them be better or worse suited to conduct on Mars? 4 How does the size (thickness) of Mars’s atmosphere compare to Earth? What issues could that difference cause for humans trying to land and live on Mars? 5 Could we change Mars’s atmosphere? This is called terraforming. How could we terraform Mars to make it more suitable for humans?