Why does fire burn wood?

Why does wood burn quickly when put on a fire that is already blazing?

• Answer:

  Because heat is a big factor in starting and keeping a fire. You have air, and fuel, and the heat is already factored in. Yes, but that is not all The wood that is already there burning helps too because the fact that it is burning means that most of the wood is dry, and dry wood burns much faster than wet or damp wood. Plus, the dry burning wood dries out any new wood that is placed on top of it, making all of the wood dry, which is the same as stacking tinder, as it is already ready to be set ablaze.