Darwin's Puzzle Box

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Across
  1. 2. the force that pulls objects towards the center of the Earth
  2. 3. the largest planet in our solar system
  3. 5. A type of energy that comes from the Sun and powers the solar system.
  4. 7. The system in the human body that allows breathing and oxygen exchange.
  5. 9. The force that slows down moving objects due to contact between surfaces.
  6. 10. The type of energy produced when an electric current passes through a wire
  7. 12. A type of change where materials can return to their original state, such as melting ice.
Down
  1. 1. the system transporting blood and oxygen to the body
  2. 4. The process where water, wind, or ice break down rocks into smaller particles
  3. 6. The gas that plants take in during photosynthesis.
  4. 8. A layer of Earth that contains minerals, air, and organic matter, essential for plant growth
  5. 11. a type of circuit where electricity flows in one continuous loop