Elements and Nature

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Across
  1. 3. It gives us light and heat during the day
  2. 4. It cleanses the air
  3. 5. It burns
  4. 7. It's very hard and usually grey
  5. 8. They can walk, some can fly and others can swim
Down
  1. 1. They only insect, that humans find beautiful
  2. 2. 70% of your body it's composed by it
  3. 6. You find it in the field, it's green
  4. 9. You can see it at night in the sky