Short clever riddles for teens

I have a little house in which I live all alone. It has no doors or windows, and if I want to go out I must break through the wall. What am I?

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

When you have me more, you can see only less. What Am I?

What you cannot hold it but it is yours?

What is so delicate that saying its name breaks it?

I am a seed with three letters in my name. Take away the last two and I still sound the same. What am I?

Three lives have I. Gentle enough to soothe the skin, Light enough to caress the sky, Hard enough to crack rocks.

I have all the knowledge you have. But I am small as your fist that your hands can hold me. Who am I?

My best buddy always makes mistakes. But I would easily get rid of the mistakes. What Am I?

You have to look at me to say what I show you. I offer two different purposes but I am spelled the same and I am pronounced the same.