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average year-after-year, the weather in some location averaged over some long period of time, average, year-after-year conditions of temperature and precipitation in a particular region
the region between 66.5 degrees north and south latitudes and the poles; the sun's rays strike at a very small angle in the polar zone
The climate of the centers of continents, with cold winters and warm or hot summers.
a huge area of North America which spreads from Alaska in the west to the Maritimes in the East
(oceanography) a warm ocean current that flows along the equator from the date line and south off the coast of Ecuador at Christmas time
an increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
Gases such as carbon dioxide, methane, nitrous oxide, water vapor, and ozone in the atmosphere which are involved in the greenhouse effect.
thinning of Earth's ozone layer caused by CFC's leaking into the air and reacting chemically with the ozone, breaking the ozone molocules apart
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