Across
- 3. The planet closest to the sun
- 4. A chunk of frozen matter that travels in a very long orbit around the sun
- 6. Made up of stoney/rocky material usually iron
- 8. A element on the periodic table (atomic number 1)
- 10. Groups of the same species living in the same area
- 12. A variety of life that exists on Earth
Down
- 1. A object in an electrical circuit that controls the flow of electrons
- 2. A safety device that protects electrical equipment from a sudden increase in voltage
- 5. The act of a solid becoming a liquid
- 7. A material that doesn't allow electric current to move easily
- 9. A pesticide that kills insects
- 11. A device used to measure temperature