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20 Cards in this Set
- Front
- Back
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Short-Term Climate Change is caused by ____ and ____
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e.g. El Nino and La Nina
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El Nino and La Nina
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short term changes in the tropical Pacific Ocean caused by changes in ocean surface currents and prevailing winds
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El Nino is a
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warm water event that occurs every two to seven years
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El Nino disrupts...
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cold ocean currents along the western coast of South America and changes weather patterns.
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El Nino brings__ and takes ___ for conditions to be normal
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brings heavy rain or droughts around world. conditions can last 1~2 years before normal winds and currents return
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El Nino begins when_____
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begins when unusal pattern of winds form over western pacific.
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El Nino causes_______
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causes vast sheet of warm water to move eastward toward south america.
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La Nina is the ____ to El Nino. It makes it colder/hotter than normal
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opposite. colder
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La Nina
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when surface waters in the eastern pacific are COLDER than normal.
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La Nina brings...
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colder than normal winters and greater precipitation to the pacific northwest and north central US. greater hurricane activity in western atlantic
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Global Warming
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gradual increase in temperature of the Earth's surface.
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Greenhouse Effect
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Gasses in Earth's atmosphere trap heat from the sun, keeping the atmosphere at a comfortable temperature
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Greenhouse gases
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gases in atmosphere that trap energy. (e.g. carbon dioxide, water vapor, methane)
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Scientists ahev hypothesized that _________ that add __________ to the atmosphere may be _______ Earth's atmosphere
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human activities. greenhouse gases. warming
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Since late _____'s the level of carbon dioxide in the atmosphere has increased steadily.
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1880
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Global warming is hypothesized to be blamed on ____ and _______
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human activities (burning wood, gasses etc) and climate variation
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Climate Variation
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energy from sun increases and decreases from eyar to year. or cliamte change could be a result of changes in carbondioixide and solar energy levels
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Global warming effects
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Positive- farming: places too cold can be warm enough to farm on
Negative- farming: water evaporate from exposed to soil. dry soil= blows away warmer ocean water= strengthen hurricane raise sea level worldwide=flood low lying costal area |
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Ozone Depletion caused by_______
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chlorofluorocarbons (CFC) chemicals prouduced by humans damage ozone layer
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CFC
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used by humans. chemical compounds released into air. they break down. they last for decades and rise to STRATOSPHERE. then ULTRAVIOLET RADIATION breakds down CFC molecules into atoms, uncluding chlorine. chlorine atoms break ozone down into oxygen atoms.
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