Vocabulary

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