Chain Crosswords Short Science Hard — Set 2

Hard 15×15 Set 2
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Across
  1. 1. Preserved remains of ancient life
  2. 3. Positively charged particle
  3. 6. Biological catalyst for reactions
  4. 9. Fourth state of matter
  5. 10. A word related to science
  6. 11. Mixture producing intense heat
  7. 12. A word related to science
Down
  1. 2. Group of similar living organisms
  2. 4. A word related to science
  3. 5. Uncharged particle in nucleus
  4. 7. One body blocking another in space
  5. 8. Pure substance on periodic table