1. Terrestrial Planets (Chapter 17)

2. Student Learning Objectives Identify & describe each Terrestrial Planet Compare & contrast the Terrestrial planets with our Earth

3. What are the main characteristics of Terrestrial planets? Small High density Rocky Objects Solid surfaces Metals (iron & silicates) Differentiated

4. Surfaces  Four processes alter solid surfaces. 1.Impact craters 2.Volcanoes (flood impact craters) 3.Plate tectonics 4.Weather

5. Many craters  Old surface Few craters  Young surface Daedalus Crater (taken by the Apollo 11 crew)

6. Practice Which surface is relatively older? A B

7. What are some features of Mercury? 2/5 Size of Earth −290 °F to +800 °F  Mercury has a 2/3 resonance with the Sun. 2 Rotations 3 Revolutions

8.  Mercury is almost all core.

9. 0 Moons for Mercury

10. Practice 1)Why does Mercury have such a large temperature range (−290 °F to +800 °F)? 2)What could explain the structure of Mercury (that it is mostly core)?

11. More Practice 3)Is Mercury more similar to our Moon or the Earth? 4)Is the surface of Mercury young or old? 5)Why do we see little evidence of impact craters on our Earth?

12. How do Venus and Mars compare to Earth?  Thick atmosphere  96% CO 2  Atmospheric pressure 90x greater than Earth’s  Complete cloud cover (sulfuric acid droplets) Venus

13. The North Pole of Venus APOD 9/10 Size of Earth Always +900 °F 0 Moons

15. Practice 1)Why is the temperature on Venus constant? 2)Venus spins retrograde. Why?

16. More Practice 3)Is Venus more similar to our moon or the Earth? 4)Is the surface of Venus young or old? 5)Earth has a surface feature that dissolves CO 2. What is it?

17.  Seasons similar to Earth’s seasons  Thin atmosphere  95 % CO 2  Atmospheric pressure 1% of Earth’s Mars

18. 2 Moons for Planet Mars

19. 1/3 Size of Earth −220 °F to +70 °F Frozen polar caps CO 2 & H 2 O Northern Polar Ice Cap of Mars NASA

21. Practice 1)What would cause Mars to have seasons similar to Earth’s seasons? 2)Mars has an atmosphere dominated by CO 2, but it does not have a greenhouse effect. Why?

22. More Practice 3)Is Mars more similar to our moon or the Earth? 4)Is the surface of Mars young or old? 5)What is the name of the current NASA rover exploring on Mars?