Why Does the Moon Change Shape?

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Across
  1. 4. difficult or impossible to understand, explain, or identify
  2. 6. a shape resembling a segment of a ring tapering to points at the ends
  3. 8. the Earth’s natural satellite that orbits around the Earth
  4. 9. carried out in gradual stages; staggered
  5. 10. a number of things, events, or people of a similar kind or related nature coming one after another
Down
  1. 1. a natural or chance marking, configuration, or design
  2. 2. a small, thin piece of something cut or split off a larger piece
  3. 3. the curved path around a celestial body such as the sun
  4. 5. to move or cause to move in a circle around an axis or center
  5. 7. any complete round or series of occurrences that repeats or is repeated