Why did the Girl throw the butter out of the window?

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 every person. What am I?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

What does this rebus riddle mean?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

How can you make number one disappear by adding something to it?

What is full of holes but still holds water?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?