Introduction to Planetary Astronomy: Terrestrial Planets

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Across
  1. 1. This planet has a reddish hue because its surface rusted
  2. 3. caused larger rocks to stick together with other rocks in the protoplanetary nebula
  3. 4. smooth lava plains on the moon are caused by this geological process
  4. 6. Venus is believed to have vast surface __________ before the dramatic volcanic activity and a runaway greenhouse removed all the surface water
  5. 9. most of the cratering in the universe happened in the ________ billion years
  6. 14. Earth is the only terrestrial planet to have a _____________ which protects its from solar and galactic particle radiation (2wrds)
  7. 16. the reason that venus is so much hotter than earth (3wrds)
  8. 21. conservation law that caused the gas cloud to flatten into the protoplanetary disk
  9. 23. Water was on the surface of mars ___________ of years ago
  10. 24. this location has the thinnest lava in the solar system
  11. 25. Large __________ are thought to have caused Earth's moon, Venus spinning backwards and mercury's odd core
  12. 26. main chemical in Mars' Atmosphere
  13. 27. the new set of missions heading to the moon, and setting the first woman on the moon in 2024 is called ________
Down
  1. 2. conservation law that caused the gas cloud to spin
  2. 5. the reason for 3km high cliffs on mercury
  3. 7. the nitrogen that makes up the earth's atmosphere is made from UV light breaking apart this outgassed element
  4. 8. caused small flakes to stick together in the early protoplanetary nebula(2wrds)
  5. 10. coronae on venus are caused by this geologic surface process
  6. 11. only Earth and Mars have these (2wrds)
  7. 12. long crack features seen in the mare on the moon
  8. 13. the amount of times stronger Venus's surface pressure is than Earth's
  9. 15. is considered the terrestrial planet with the oldest geological surface
  10. 17. is the largest volcano in the solar system
  11. 18. venus has _____ impact craters on its surface
  12. 19. ices only condensed outside of the ________ in the protoplanetary nebula (2wrds)
  13. 20. This is one of the largest of this type in the solar system, and is the remnant of the largest impact crater on Mars (2wrds)
  14. 22. Earth's oxygen atmosphere came from ________ on the planet