1. Ch. 29 Sec. 2 Terrestial Planets

2. First four  Mercury, Venus, Earth, Mars  Solid, Rocky surfaces

3. Mercury Closest Planet- 1/3 size of Earth Slow spin of 1407.6 hrs  In two Mercury Years, three days have passed Atmosphere of oxygen and sodium  427 o C day temp & -173 o C night temp Based on radio observations Crater terrain formed from lava flow

4. Mercury

5. Venus No moons and is the brightest planet  Albedo is.75 One day is 243 Earth days in length  Clock wise spin – rise in west and sets in east  Retrograde rotation High density and mass CO 2 and Nitrogen  Cloud cover and high greenhouse gases: from density  Hottest planet – 464 o C

6. Venus

7. Earth Water exsits in three states  Solid, Liquid, Gas  78% N and 21% O2 Precission  Earth axis wobbles: due to moon gravitational pull  26,000 yrs for one cycle  Points towards Vega

8. Earth

9. Mars Red Planet  Soil red due to high iron content Composition of CO 2 and N but low density  Low density constitutes low greenhouse effect Surface features  Shield volcanoes: Olympus Mons: wide as Colorado and 3x higher than Everest  Dried river beds and runoff channels: suggests liquid water  “Dry Ice” polar Ice caps

10. Mars