Across
- 2. The law of ___ of angular momentum means that as objects become smaller, they must roate faster
- 9. Earth also has a lot of atmospheric Oxygen because of ____ done by plants and algae
- 11. Which astronomical model puts the sun in the middle of the solar system?
- 13. The effect some gasses have in an atmosphere that traps heat from the sun
- 14. Organization that searches for extraterrestrial life
- 17. Inner planets orbit the sun faster than the outer planets because of _____ momentum
- 18. The rotation around a planet's _____ causes day and night
- 19. This ice-giant experiences the least amount of gravitational pull of all the planets
Down
- 1. The effect of gravity relies on mass and what other quantity?
- 2. Makes up the majority of the atmosphere on both Mars and Venus
- 3. Fundamental "force" that keeps the planets orbiting the sun
- 4. This planet has an atmosphere that is mostly Nitrogen.
- 5. Large planets that hold onto much of the gases from the solar nebula
- 6. The planet closest to the sun
- 7. Chemical that is necessary for life
- 8. This planet has a runaway greenhouse effect
- 10. The ____ zone, or Goldilocks zone, is where life-bearing planets are believed to be
- 12. What has happened to the amount of Carbon Dioxide in Earth's atmosphere over the last 100 years?
- 15. Mars only receives a small percent of the ____ that reaches Earth
- 16. This chemical may have once flowed on Mars' surface.