Why does the moon change shape?

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Across
  1. 3. Something that can be observed again and again in a way that can be predicted
  2. 4. A set of events that repeats in the same order over and over
  3. 6. Moon phase when the Moon looks like half of a circle
  4. 10. Moon phase when the Moon looks like a little less than a full circle
  5. 11. Moon phase when the Moon looks like a sliver
  6. 12. A pretend version of something that scientists use when the real thing is too big, small, or complicated to work with
Down
  1. 1. The part of the Moon that we can see on a particular night
  2. 2. Moon phase when the Moon looks like a circle
  3. 5. The process of the Moon going through all of its phases
  4. 7. (Revolve)Circling another object, like the Moon around the Earth
  5. 8. Moon phase when the Moon looks completely dark
  6. 9. A large, round object in the night sky that can reflect the Sun’s light