What is it? Is it natural or made by people?
It's oil. Oil is natural.
What is it? Is it natural or made by people?
It's wood. It's a natural material.
What is it? What is it made of?
It's glass. Glass is made from sand.
What is it? What is it made of?
It's a paper. It's made from wood.
What is it? Is it natural or made by people?
It's the sand. Sand is natural.
What is it? What is it made of?
It's plastic. It's made from oil.