These tiny pieces are melted and formed into pellets, which are stretched into long fibers like thread and woven into fabric for clothing. A substance found beneath the Earth's surface that can be used as a source of energy. Fuel Any material, like wood, coal, oil, or gas, that is burned to supply heat or energy. Landfill A specially constructed site for safely and effectively disposing of garbage. Natural resource Materials in nature, like trees, that are necessary for life.
Resources provide ingredients for food, fuel, and goods.
Nonrenewable resource A natural resource from the Earth that exists in limited supply, like oil or coal. Once this supply is used up, the resource is gone forever. Oxygen A gas that exists naturally in the atmosphere and is produced by plants during photosynthesis that humans and other animals breathe. Packaging Wrappers or containers used to protect food or other products from dirt, germs, and damage. Packaging often provides information about the product.