Answer:
My children are near and far. No matter that I know where they are. The gift I give them make their day. But if I were gone they would wander away.
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
Don't do this in the shallow end.
Forward I’m heavy, but backwards I’m not.
What never gets any wetter no matter how hard it rains?