Why does the Moon change shape?

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Across
  1. 4. moon phase when the Moon looks like a little less than a full circle
  2. 5. the process of the Moon going through all of its phases
  3. 8. the part of the Moon that we can see on a particular night
  4. 9. a pretend version of something
  5. 10. moon phase when the Moon looks like a sliver
  6. 11. moon phase when the Moon looks completely dark
Down
  1. 1. moon phase when the Moon looks like half of a circle
  2. 2. moon phase when the Moon looks like a circle
  3. 3. (revolve) circling another object, like the Moon around the Earth
  4. 6. a set of events that repeats in the same order over and over
  5. 7. something can be observed again and again and again in a way that can be predicted
  6. 9. a large, round object in the night sky that can reflect the Sun’s light