Easy clever riddles for teens

I am sweet and tasty, sometimes hard or chewy. I wear a bright paper coat that is noisy and crinkly. Who am I?

You have me today, Tomorrow you'll have more. As your time passes, I'm not easy to store. I don't take up space, But I'm only in one place. I am what you saw, But not what you see. What am I?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

I know a country. If you remove the last aplhabet of its name, it will become a part of your body. Do you?

I always work under pressure and by myself is the only way I'm hurt. I was formed under pressure and for woman I'm pleasure. What am I?

A word I know, Six letters it contains, Subtract just one, And twelve is what remains.

It is an insect, and the first part of its name is the name of another insect. What is it?

One company had two factories, in different parts of the country, that were making the same style of shoes. In both factories, workers were stealing shoes. How, without using any security, could that company stop the stealing?

What flies without wings?

What loses its head in the morning but gets it back at night?