Natural world

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Across
  1. 3. What is the name for a large storm caused by low pressure, with lots of strong wind and rain?
  2. 4. What is the season that comes after summer?
  3. 6. What is the name of a creature that has six legs and no skeleton?
  4. 12. What is the name for a type of animal that makes milk and is warm-blooded?
  5. 13. What is the name of a flying dinosaur?
  6. 16. The earth rotates around which star?
  7. 18. What is the name of the liquid rock that erupts from a volcano?
  8. 19. What is the name of an animal that only eats plants?
  9. 20. Frozen water is called what?
  10. 21. What is the name of our galaxy? (5,3)
Down
  1. 1. What is the name of the gas that humans need to breathe to survive?
  2. 2. What is the name of the largest creature that's ever lived? (4,5)
  3. 5. What do we measure in heat or cold in degrees?
  4. 7. The sun is a type of what?
  5. 8. What is the name for animals like frogs and turtles that can live on land or in the water?
  6. 9. What is the name of our group of planets and the sun? (5,6)
  7. 10. What is the name of the gas we breathe out, and that is also used to make drinks fizzy? (6,7)
  8. 11. What is the name of the layer of gas that surrounds our planet?
  9. 12. What is the name for a type of animal that keeps its babies in a pouch?
  10. 14. What is the name for a baby frog in the second stage of its life cycle?
  11. 15. What does a caterpillar turn into before it becomes a butterfly?
  12. 17. What is the closest planet to the sun?