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Across
- 2. The distance between one wave peak and the next
- 5. The part of an experiment that stays the same for comparison
- 7. The smallest piece of matter that makes up everything
- 8. A substance that living things need for energy and growth
Down
- 1. Facts that show something is true
- 3. When one substance soaks up or takes in another
- 4. The speed of something in a given direction
- 5. A path that electricity travels along
- 6. A hard solid piece of the Earth made of minerals