What are the different methods of preserving food?

Level: Primary / Intermediate

Wikipedia is often a good starting point for questions. It has a pretty good search box. Just type in your subject  and click search. E.g. for this one type in the words food preservation. If it's all a bit confusing - try theSimple Wiki version of the article.

You will find a main article on how food preservation works. Look towards the bottom of the page for more information and links.

How Stuff Works also has some great info on food preservation.