Earth

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Across
  1. 1. system the sun and the planets that move around it
  2. 3. how much of something there is
  3. 5. heat
  4. 6. the world
Down
  1. 1. provide what is needed for something
  2. 2. the outside of something
  3. 3. the study of stars and planets
  4. 4. how hot or cold something is