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Across
- 1. A natural solid substance found in the earth
- 5. The amount of matter in an object
- 6. The distance between one wave peak and the next
- 7. To sort things into groups based on their features
- 8. How often something happens in a given time
- 9. An object that attracts iron and some other metals
Down
- 2. A pure substance made of only one type of atom
- 3. How hot or cold something is
- 4. A push or pull that can change how something moves