Class4 crossword puzzle

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Across
  1. 4. Layer of gas that surrounds a planet
  2. 6. way Our solar system is a part of this galaxy
  3. 7. This breakfast food comes in a box
  4. 12. India’s first satellite
  5. 13. Saving , using and protecting resources wisely -
  6. 14. A solid substance that is made up of minerals
  7. 15. When this is low it is cold, when it is high it is hot.
  8. 18. The state of matter with a definite shape and volume
  9. 19. The process by which plants prepare their food
Down
  1. 1. The organ that cleans the blood
  2. 2. The Earth's outer layer.
  3. 3. An animal that eats both plants and meat.
  4. 5. The bone that encloses the brain
  5. 8. An animal that is close to being extinct
  6. 9. The natural satellite of the Earth:
  7. 10. The process of a liquid turning into a gas.
  8. 11. The planet known as the "Red Planet"
  9. 16. Instrument used for seeing stars and planets clearly
  10. 17. The largest planet in our solar system
  11. 20. The organ that covers your body