Class 4 Crossword Puzzle

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Across
  1. 4. the gaseous state of water.
  2. 7. the outer layer of gas that surrounds Earth.
  3. 8. a chemical reaction that releases a lot of light and heat.
  4. 9. what is common between a bird, a bat and a butterfly?
  5. 10. the cutting of trees by humans.
Down
  1. 1. the process by which plants make their food.
  2. 2. the organs that enable us to see.
  3. 3. the organs that are used for breathing.
  4. 5. hot molten rock that is located under the Earth's surface.
  5. 6. animals which eat other animals.