Earth

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