Science crossword

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