A colorless, odorless, poisonous gas, produced by incomplete burning of carbon-based fuels, including gasoline, oil, and wood. Carbon monoxide is also produced from incomplete combustion of many natural and synthetic products, including cigarette smoke. When carbon monoxide enters the body, it ...
Fuels that can replace ordinary gasoline. Alternative fuels may have particularly desirable energy efficiency and pollution reduction features. Alternative fuels include compressed natural gas, alcohols, liquefied petroleum gas (LPG), and electricity.
The standard system that state and local air pollution control programs use to notify the public about levels of air pollution. The AQI tracks levels of two pollutants - ozone (smog) and particle pollution (tiny particles from ash, vehicle exhaust, soil dust, pollen, and other pollution).
Air pollution produced when acid chemicals are incorporated into rain, snow, fog or mist. The "acid" comes from sulfur oxides and nitrogen oxides, products of burning coal and other fuels. When sulfur dioxide and nitrogen oxides are released from power plants and other sources, winds blow ...
The ball is thrown in after the ball has crossed the touch line. A player taking a throw in must have both feet on or behind the touch line, must maintain contact with the ground, and must use a two-handed throw made from behind the head. A goal cannot be score directly from a throw-in.
A tackle in which the defender slides along the surface of the field of play before making one-footed contact with the ball.
A red card is issued to a player when that player has committed a serious infraction or has been issued with two yellow cards within the same game. The red card held up by the referee to signal that a player is being sent off. The player sent off cannot be replaced.
A penalty kick is awarded when a foul has been committed inside the penalty area in front of the goal. A penalty is taken by one player opposed only by the goal keeper.
