SCIENCE & NATURE

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Across
  1. 5. A natural satellite that orbits a planet
  2. 7. The process by which a caterpillar becomes a butterfly
  3. 8. The organ that allows humans to breathe
  4. 12. The change of a liquid to a gas
  5. 13. A gas that plants use to make food during photosynthesis
  6. 14. The study of matter and its properties
  7. 15. The force that resists motion between two surfaces
Down
  1. 1. A substance made up of two or more elements chemically joined
  2. 2. The force that pulls objects toward the Earth
  3. 3. A scientist who studies living organisms
  4. 4. The organ in the human body that pumps blood
  5. 6. The smallest unit of life
  6. 9. Energy that comes from the sun
  7. 10. A group of stars forming a pattern in the sky
  8. 11. The natural home of an animal or plant