Author's Riddles

The unseen (medium)

Question: It makes everyone blind. You can't see it and it will always come back for you.

What is it? (medium)

Question: What creature first walks on four legs, then on two legs and then on three legs.

Question: It's always there. From your birth to your dead. It destroys mountains and at the same time it gently strokes the grass. What is it.