What Am I Riddles

Question: 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?

Question: Upon your lonely journey I accompany you, whether you travel through endless mountains or seas of blue. Wherever you go, I keep your place. Lost you're not, when I'm embraced. What am I?

Question: You put me in dry but then I get wet.
The longer I stay in, the stronger it will get.

What am I?

Question: Something different to show every week, but I'm still the same place.
If you're eating it's probably butter that you taste.

What am I?

Question: Walk on the living, they don't even mumble.
But walk on the dead, they mutter and grumble.

What are they?