Change my first , it's on top Change my last, it keeps you warm What humanity's pal has to say For they can't say much else

One version of me is silent Pyramids in Maine are quite violent Another lies in song Where up me they run along Some make mountains out of me Though moles here not be

A cozy home for owls and cats, a good place to hide and play. I may hold animals, fodder or tack, or great big piles of hay.

As a man, I know nothing. As a woman, I commune with animals. But I am not a person. What am I?

A trapping of compounds close to the surface, Or a reaction of compounds in sunlight can curse us. Either way, it’s harder to breathe or see, Sadly common in cities; can you guess me?