Hhh

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Across
  1. 5. correctly
  2. 7. what it's made of
  3. 8. substances combined
  4. 11. features/traits
  5. 15. + charge
  6. 16. new machines
  7. 17. study of substances
  8. 18. test/try
Down
  1. 1. across subjects
  2. 2. surroundings
  3. 3. repeated design
  4. 4. no charge
  5. 6. basic rules
  6. 8. atoms joined
  7. 9. evidence-based
  8. 10. pure substance
  9. 12. find out
  10. 13. smallest unit
  11. 14. has mass, takes space
  12. 15. force per area