Riddles

I'm full of keys but can't open any locks. What am I?

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

I have a head, a tail, but no body. What am I?

I'm tall when I'm young, and short when I'm old. What am I?

What do you call a bear with no teeth?

I can fly without wings. I can cry without eyes. Wherever I go, darkness follows me. What am I?

What gets wetter as you dry?

I'm not alive, but I can grow. I don't have lungs, but I need air. What am I?

I'm black and white and loved all over the world. What am I?

I'm a room with no windows or doors. What am I?

I have cities, but no houses. I have forests, but no trees. I have water, but no fish. What am I?

I can be cracked, made, told, and played. What am I?

I'm a word of letters three, add two and fewer there will be. What am I?

The more you take, the more you leave behind. What am I?

I have a heart that never beats. I can flow without water. What am I?

I have keys but can't open doors. What am I?