It is completely destroyed. It is completely changed into heat energy. It changes into other types of matter and energy. It physically changes into the gaseous phase.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What happens to a wooden log when it is burned?
Possibilities:
- It is completely destroyed.
- It is completely changed into heat energy.
- It changes into other types of matter and energy.
- It physically changes into the gaseous phase.

It changes into other types of matter and energy.