What Am I Riddles

Question: My name can have any letter of the alphabet, but I always have 2 X's.

What am I?

Question: I am alive yet not alive. I can fly yet always on the ground. I am delicate yet can lift tonnes. 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?

Question: I'll capture you, hold you, and to your dismay, drag you thru space and time, all in one day. Move 'cross the globe with a single command, now tell me what I'll subject you to at your demand.

Question: I'll bring out your bulls,
and slow your roll.
I may even come out of your skull.

What am I?