Crossword

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Across
  1. 1. a large piece of something
  2. 2. one basic chemical substance
  3. 6. force when pressing something
  4. 8. any round object
  5. 9. changes structure of substances
Down
  1. 1. to crash
  2. 3. a large amout of substance
  3. 4. the outside part of certain foods
  4. 5. happening slow or fast
  5. 7. an expert in geology