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6 Cards in this Set
- Front
- Back
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ice age
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a glacial episode during a past geological period.
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aerosol
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a substance enclosed under pressure and able to be released as a fine spray, typically by means of a propellant gas
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sunspot
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a spot or patch appearing from time to time on the sun's surface, appearing dark by contrast with its surroundings
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greenhouse effect
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the trapping of the sun's warmth in a planet's lower atmosphere due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface
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fossil fuels
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a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
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global warming
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a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants
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