Maize, commonly known as corn, is a large grain plant domesticated by indigenous peoples in Mexico. The six major types of corn are dent corn, flint corn, pod corn, popcorn, flour corn, and sweet corn.
Petroleum refining processes are the chemical engineering processes and other facilities used in petroleum refineries to transform crude oil into useful products such as LPG, gasoline or petrol, kerosene, diesel oil and fuel oils.
To produce a carbon fiber, the carbon atoms are bonded together in crystals that are more or less aligned parallel to the long axis of the fiber as the crystal alignment gives the fiber high strength-to-volume ratio.
The characteristics of a roof are dependent upon the purpose of the building that it covers, the available roofing materials and the local traditions of construction and wider concepts of architectural design and practic.