Chain Crosswords Medium Chain Nature Hard — Set 1

Hard 15×15 Set 1
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9
10
Across
  1. 4. A word related to science
  2. 6. Uncharged particle in nucleus
  3. 8. Slow-moving river of ice
  4. 9. Preserved remains of ancient life
  5. 10. Group of similar living organisms
Down
  1. 1. Positively charged particle
  2. 2. Force attracting objects to Earth
  3. 3. Device for controlled nuclear reactions
  4. 5. A word related to science
  5. 7. Pure substance on periodic table