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Portmanteau word made from 'smoke' and 'fog' to designate a haze that forms when smoke and chemical pollutants combine with moisture
Contamination of the natural environment by human activities and inventions
Period of mild, dry weather occurring in late October or early November after a period of colder weather
The process of a substance going directly from a vapor form to a solid at the same temperature, without going through the liquid phase
Areas north and south of the equator considered Earth's hottest regions
Continuous circulation of water from clouds to Earth as rain or snow and back to the clouds again through evaporation
Radiant power that comes to Earth from the Sun in the form of light
Relatively calm center of a hurricane
Aggregation of minute droplets of water or ice crystals suspended in the air
Force exerted by the weight of air against the ground
Boundary between the cold air of a region near the North or South Pole and the warmer air of the tropical regions
Scientific field dealing with the processes and phenomena of the atmosphere
Process by which heat energy is trapped and held by Earth's atmosphere
Small whirlwind that carries debris in a narrow column, especially in dry plains regions
Forms when a mass of warm air meets a mass of cold air and no movement occurs
Narrow band of fast-moving air currents found at altitudes of 10 to 15 miles
This occurs when a cold front overtakes a warm front and displaces it upward
Amount of water vapor in the atmosphere
A brief instance of snow with thin, single-flaked showers
An arch of colors formed in the sky, caused by the refraction and dispersion of the Sun's light by rain or other water droplets
Precipitation with elevated hydrogen ion levels caused by sulfur dioxide and nitrogen oxide emissions from fossil fuel combustion or volcanic eruption
Temperature at which water vapor condenses into a liquid
Fast-spinning funnel-shaped column of air and water occurring over an ocean or lake, usually in tropical areas
Dry dusty wind that blows from the interior of the Sahara Desert toward the west coast of Africa, especially from November to March
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