What Am I Riddles

Question: What's higher than mountains, Smaller than trees?

Question: Not only a seat, it’s also a head - what is it?

Question: There is a couple that is always together. They go anywhere they want to go. They can't be separated. No one can touch them. They are the size of a ping pong ball. What is it?

Question: I always murmur but never talk, i always run but never walk, and I have a bed but I don't sleep. What am I?

Question: Sometimes I'm high and sometimes low,
and I creep between your toes.
My orders come from the sky,
I make men fall and rise.

What am I?