Why Does The Moon Change Shape?

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Across
  1. 4. an expert who studies the sun, moon, stars, and planets
  2. 5. exact, precise
  3. 6. turns around
  4. 7. the shape of the moon when you can only see the thin, curved part
Down
  1. 1. stages of growth; shapes of the moon at a particular time
  2. 2. a tool that makes distant objects closer
  3. 3. a number of related things coming one after the other
  4. 5. a slender, thin piece