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Across
- 3. The part of an experiment that stays the same for comparison
- 4. Small pieces of rock and soil carried by water and wind
- 7. The force that slows things down when they rub together
- 8. A form of energy that allows us to see
- 9. How tightly packed the matter is in something
Down
- 1. A material that electricity or heat can pass through easily
- 2. A tiny particle of light energy
- 5. The wearing away of land by water, wind, or ice
- 6. The power that makes things move or change