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Across
- 1. The central part of a cell that controls its activity
- 5. A quick back-and-forth movement
- 6. A mountain with an opening that can erupt hot lava
- 8. The natural home of an animal or plant
- 9. All the chemical processes in your body that keep you alive
Down
- 2. When a gas cools and turns back into a liquid
- 3. A mixture where one substance dissolves completely in another
- 4. Facts that show something is true
- 7. The remains of a plant or animal from long ago preserved in rock