Firewood

Question: What is fire?
  Answer: Fire is a process that converts fuel into heat, and light. - 70

Question: What is wood?
  Answer: Wood is the hard, fibrous part of trees that grows beneath the bark. - 234

Question: Where does wood come from?
  Answer: Wood is grown by trees in the forest. The mature trees are cut down to make timber. The timber is cut, sawed, or split into lumber, planks, and boards of standard lengths. The wood is then dried, and sold for use as building material, fuel, and paper pulp. - 235