Answer:
What is the edge of earth and bread?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
I'm a kind of cup that doesn't hold water, but makes a lot of noise repeatedly. What am I?
I cover what's real; hide what is true, but sometimes bring out the courage in you. What am I?
In your fire you hear me scream creaking and whining yet I am dead before you lay me in your hearth.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.