Easy logic riddles with simple answers

It can fill a room without occupying space. What is that?

What can go up a chimney down but not down a chimney up?

I look flat, but I am deep, Hidden realms I shelter. Lives I take, but food I offer. At times I am beautiful. I can be calm, angry and turbulent. I have no heart, but offer pleasure as well as death. No man can own me, yet I encompass what all men must have.

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

Beth's mother has three daughters. One is called Lara, the other one is Sara. What is the name of the third daughter?

If you drop me I'm sure to crack, but give me a smile and I'll always smile back.

A man while looking at a photograph said, "Brothers and sisters have I none. That man's father is my father's son." Who was the person in the photograph?