crossword 2

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Across
  1. 3. blend of two or more substances
  2. 4. based on observation and evidence
  3. 6. consistent or recurring arrangement
  4. 8. scientific procedure to test a hypothesis
  5. 10. arrangement or structure of parts
  6. 11. in a fitting or proper manner
  7. 13. traits that define or describe a material
  8. 14. building blocks of all matter
  9. 16. crossing boundaries between academic fields
  10. 17. cannot be broken down chemically
  11. 18. look into closely or research
Down
  1. 1. involving machines, tools, or innovation
  2. 2. subatomic particles with a positive charge
  3. 3. physical substance in general
  4. 5. study involving reactions and substances
  5. 7. natural world or ecological setting
  6. 9. particles with no electrical charge
  7. 12. physical force applied to something
  8. 13. fundamental rules or beliefs
  9. 15. smallest units of compounds