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Across
- 1. The process of getting bigger or more developed
- 4. The power that makes things move or change
- 6. The amount of matter in an object
- 7. A mountain with an opening that can erupt hot lava
- 8. A form of energy used to power lights and machines
- 9. How tightly packed the matter is in something
Down
- 2. A tool for measuring temperature
- 3. To sort things into groups based on their features
- 5. A state of matter that spreads to fill any space