Across
- 4. A large, flightless bird from Australia
- 5. The powerhouse of a cell
- 6. The force that pulls objects towards the center of the Earth
- 8. Substance that accelerate a chemical reaction without being consumed
- 9. Theory describing the expansion of the universe
Down
- 1. A large, round celestial body
- 2. The process by which plants make their own food using sunlight.
- 3. The study of the structure of the human body
- 4. What you do when you are hungry
- 5. The closest planet to the Sun
- 7. The capital of France