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Across
- 6. A form of energy used to power lights and machines
- 7. To sort things into groups based on their features
Down
- 1. Two or more substances mixed together but not chemically joined
- 2. The steps followed to do an experiment
- 3. The central part of a cell that controls its activity
- 4. Related to the large plates that make up Earth's surface
- 5. The smallest piece of matter that makes up everything