ES The Moon and Its Physical Features

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Across
  1. 3. Large, empty plains resembling bodies of water from earth
  2. 4. The moon lacks a dense envelope of gases called _?_
  3. 6. Seismic waves on the moon are called _?_.
  4. 7. The moon's gravity compared to the earth's.
  5. 8. Lunar depressions created by impact with meteoroids.
  6. 9. Long, twisting canyons of unexplained origins
  7. 11. Light lines of debris ejected from some impact craters.
  8. 12. a famous crater of the moon's southern hemisphere.
Down
  1. 1. He's often observed during a full moon
  2. 2. A weak _?_ doesn't protect the moon from solar wind.
  3. 5. High hills on the moon's surface.
  4. 10. His invention, the telescope, revolutionized astronomy.