Across
- 2. The force that pulls objects toward the Earth.
- 3. The basic unit of electric current.
- 4. The basic unit of life.
- 6. A tool used to measure temperature.
- 7. The planet known for its red color.
- 9. The process by which plants make their food.
- 10. Our closest star.
Down
- 1. A chemical bond where electrons are shared.
- 5. The force that opposes motion between two surfaces.
- 8. The smallest unit of an element.