Good Riddles

Question: You feel me but can't touch me, you can hear me but can't see me. I move leaves in trees, you need me to live. At my highest speeds i uproot trees and mow down houses. I cause waves over the ocean. I've been around since the beginning of life. What am I?

Question: Can you make VI out of IX?

Question: Spell "Hard Water" using only 3 letters.

Question: What is in the middle of nowhere?

Question: What kind of keys won't open a door?