Earth science

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Across
  1. 3. an object in space such as a moon
  2. 4. an imaginary line which something revolves around
  3. 7. the round body that circles around the earth
  4. 8. to turn around like a wheel
Down
  1. 1. the planet we live on
  2. 2. a large group of stars
  3. 5. the star which is the centre of our solar system
  4. 6. System, the collection of 8 planets and their moons in orbit around the sun