Our Rocky Neighbors: The Inner Planets

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Across
  1. 1. On Venus and Uranus, the sun rises in the ________________.
  2. 4. Venus' thick atmosphere traps heat because of the ______________________ effect.
  3. 5. Earth lies between the planets Mars and __________________.
  4. 8. The four Rocky Planets include ___________________, Venus, Earth, and Mars.
  5. 9. Mercury lacks an atmosphere because the ____________________ is too weak to hold it.
  6. 10. The earth's crust is cracked into a number of ___________________ that move.
Down
  1. 2. Olympus Mons is three times taller than Mt. Everest, and is the tallest volcano in the __________________ .
  2. 3. Because of bombardment from meteorites long ago, Mercury's surface looks like our ___________________.
  3. 6. The Rocky Planets are also called the Inner Planets and the Terrestrials. Terrestrials means ___________________.
  4. 7. _____________________ is the only planet on which unmanned spacecraft have successfully landed and explored.