What am I?

I climb higher as I get hotter. I can never escape from my crystal cage. What am I?

I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost everybody. What am I?

Weight in my belly, trees on my back. Nails in my ribs, feet I do lack. What am I?

If you throw me out the window, I'll leave a grieving wife. Bring me back, but through the door, You'll see someone giving life. What am I?

Riddles and Answers