What causes day and night?

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Across
  1. 3. the star the planets rotate around
  2. 5. our home planet
  3. 6. the part of the earth facing the sun
  4. 7. the moon is completely visible
  5. 9. left of the moon is covered in shadow
Down
  1. 1. to make a full turn
  2. 2. the left side of the moon is visible
  3. 4. the moon is not visible
  4. 8. the shapes of the moon we see as it moves