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Across
- 2. Force attracting objects to Earth
- 4. Positively charged particle
- 6. Fourth state of matter
- 8. Large molecule essential for life
- 9. Naturally occurring inorganic solid
- 10. Smallest discrete unit of energy
Down
- 1. Wearing away of land by water or wind
- 3. A word related to science
- 5. Diffusion of water through a membrane
- 7. Biological catalyst for reactions