Easy logic riddles for teens with simple answers

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?

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?