What Am I Riddles

Question: I'm the part of a bird that's not in the sky,
I can swim in the ocean and remain dry?

What am I?

Question: Permanent feature and teacher, unless it results in you being buried by the preacher - what is it?

Question: What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Question: I am a small room,
but no life lives inside,
no matter what weather looms,
very cold my residents reside.
What am I?

Question: You throw away the outside, eat the inside, and throw away the inside.