What Am I?

What gets wetter as it dries?

What has many teeth but can’t bite?

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

I run all day but never walk. I have a mouth but never talk. I have a bed but never sleep. I have a head but never weep. What am I?

I’m not alive, but I grow; I don’t have lungs, but I need air; I don’t have a mouth, but water kills me. What am I?

I’m light as a feather, yet the strongest person can’t hold me for more than a few minutes. What am I?

What has keys but no locks, space but no room, and you can enter but not go in?

What has cities but no houses, forests but no trees, and rivers but no water?

What’s full of holes but still holds water?

What has to be broken before you can use it?