Earth

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