What causes day and night?

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Across
  1. 1. when light from the sun hists the earth
  2. 5. the earth is like a spinning_______
  3. 6. the time after the sun sets
  4. 7. this never stops rotating
  5. 8. spins around
Down
  1. 1. time after the sun rises
  2. 2. the earth does this
  3. 3. we see them at night
  4. 4. the planet we live on