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Across
- 2. Smallest discrete unit of energy
- 4. Device for controlled nuclear reactions
- 6. Group of similar living organisms
- 9. Force attracting objects to Earth
- 10. Positively charged particle
- 11. Wearing away of land by water or wind
Down
- 1. Uncharged particle in nucleus
- 3. Biological catalyst for reactions
- 5. Solid with ordered atomic structure
- 7. A word related to science
- 8. Large molecule essential for life