Vocabulary

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Across
  1. 1. the outside of something
  2. 4. system the Earth and other planets moving around the sun
  3. 7. providing what someone or something needs
  4. 8. the measure of how hot or cold something is
Down
  1. 2. the study of stars and planets
  2. 3. the feeling of heat
  3. 5. how much of a thing there is
  4. 6. a model of Earth