Across
- 7. The measure of how hot or cold something is
- 8. The smallest unit of an element
- 9. The process of plants making food using sunlight
- 10. A scientist who studies stars and planets
- 12. A gas that humans breathe out
- 13. The planet known as the “Red Planet”
Down
- 1. The study of life and living organisms
- 2. The center of an atom
- 3. The powerhouse of the cell
- 4. The ability to do work or cause change
- 5. The force that pulls objects toward Earth
- 6. Liquid state of H2O
- 11. The genetic material that carries information in cells