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Across
- 1. Wearing away of land by water or wind
- 3. Mixture producing intense heat
- 7. Positively charged particle
- 8. Naturally occurring inorganic solid
- 9. Biological catalyst for reactions
Down
- 2. A word related to science
- 4. Device for controlled nuclear reactions
- 5. Solid with ordered atomic structure
- 6. Preserved remains of ancient life
- 7. Fourth state of matter