Riddle: 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 am I?
This thing that asks us what is it in the riddle, seems pretty dark and scary but also helpful and beautiful. There not so many things that fits this description so, this riddle is not so difficult even though it is not so easy.
It is possible that you have already figured the answer out. However, if you could not, I shall give you the answer and maybe explain it a little bit. The answer of this riddle is an ocean. Oceans are scary and helpful at the same time since you can easily die in one but can get food from it as well.
The answer is: An ocean.