I have an eye but still cannot see.

Who am I?

What demands an answer, but asks no questions

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

I am white when I am dirty, and black when I am clean. What am I?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. 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 every person. What am I?