RIDDLE ME

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

What invention lets you look right through a wall?

What kind of a room doesn't have any walls or doors?

A man who was outside in the rain without an umbrella or hat didn't get a single hair on his head wet. Why?

What goes up but never comes down?

What has many keys but cannot open any doors?

What turns everything around but does not move?

What belongs to you but other people use it more than you do?

What word is always pronounced wrong?

What is black when you buy it, red when you use it, and gray when you throw it away?