Mantle, crust, core

I am the sky, you are the earth
As I live I hold you together
I keep you from crumbling under the darkness of space.
When I cry, I enrich your soil
When I shine, my light beams through your trees
My air is what keeps you alive
But your gravity is what pulls me towards you.
Without your fumes there would be no air
You destroy yourself but I still stay holding you.
Days can be clouded,
Days can be clear
None of these days would happen if either of us were gone.
You ground me
I give you a reason to look up
You make me real
I make you dream.
You make the world go round
I make sure there still is a world

You are my world
I am yours.