Nature

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Across
  1. 2. I fly when I am born, lie when I'm alive, and run when I am dead. What am I?
  2. 4. I am essential to life, yet I can take your breath away. I am both in you and around you. What am I?
  3. 5. The more there is the less you see. What is it?
Down
  1. 1. Lighter than what I am made of, More of me is hidden Than is seen. What am I?
  2. 3. I pass before the sun, yet make no shadow. What am I?