Across
- 3. Animal group that feeds young with milk
- 5. Land surrounded by water on three sides
- 7. Process plants use to convert sunlight into energy
- 10. Type of money used in a country
- 11. Imaginary line dividing Earth into Northern and Southern Hemispheres
- 13. Process where land is worn away by water or wind
- 14. Process of liquid turning into gas
- 15. Step-by-step set of instructions to solve a problem
Down
- 1. System of government where people vote for leaders
- 2. Coldest continent on Earth
- 4. Measure of electrical potential difference
- 6. Closest planet to the Sun
- 8. Element essential for human respiration
- 9. Force that attracts objects toward each other
- 12. Path an object takes around another in space