Why does the Moon change shape?

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Across
  1. 5. moon phase when the Moon looks like a sliver
  2. 6. the part of the Moon that we can see on a particular night
  3. 8. a pretend version of something that scientists use when the real thing is too big, small, or complicated to work with
  4. 10. a large, round object in the night sky that can reflect the Sun's light
  5. 11. something that happens again and again in a way that can be predicted
Down
  1. 1. moon phase when the Moon looks like a little less than a full circle
  2. 2. moon phase when the Moon looks like a half circle
  3. 3. a set of events that repeats in the same order over and over
  4. 4. moon phase when the Moon looks like a circle
  5. 7. moon phase when the Moon looks completely dark
  6. 9. circling another object, like the Moon around the Earth