Across
- 3. A push or pull on an object
- 4. The smallest unit of life
- 6. The process by which plants make food using sunlight
- 10. A scientist who studies space and celestial objects
- 11. The gas used by plants during photosynthesis
Down
- 1. The force that resists motion between two surfaces
- 2. The planet closest to the Sun
- 5. An instrument used to measure temperature
- 7. Gas used to breathe by humans and given to us by trees
- 8. The star at the center of our solar system
- 9. We need to drink everyday