Clean riddles

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth I am dissolved into air. What am I?

What goes through a door but never goes in and never comes out?

What has four legs, but can't walk?

I am always hungry and will die if not fed, whatever I touch will soon turn red.

Thirty white horses on a red hill. First they champ, Then they stamp, Then they stand still. Who are they?

I have seas without water. I have forests without wood. I have deserts without sand. I have houses with no brick. What am I?

I have billions of eyes, yet i live in darkness. I have millions of ears, yet only four lobes. I have no muscle, yet i rule two hemispheres. What am I?

What has a neck but no head?

What is the easiest way to double your money?

Thousands lay up gold within this house, but no man made it. Spears past counting guard this house, but no man wards it.