mesosphere
(mesosphere)
Princeton's WordNet
the atmospheric layer between the stratosphere and the thermosphere
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tropopause
(tropopause)
Princeton's WordNet
the region of discontinuity between the troposphere and the stratosphere
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tropopause
(ˈtrɒp əˌpɔz, ˈtroʊ pə-)
Random House Webster's College Dictionary
the boundary, or transitional layer, between the troposphere and the stratosphere.
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mesosphere
(ˈmɛz əˌsfɪər, ˈmɛs-, ˈmi zə-, -sə-)
Random House Webster's College Dictionary
the region between the stratosphere and the thermosphere, extending from about 20 to 50 mi. (32–80 km) above the surface of the earth.
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ozone layer
(ozone layer, ozonosphere)
Princeton's WordNet
a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
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ozonosphere
(ozone layer, ozonosphere)
Princeton's WordNet
a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
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chemosphere
(ˈki məˌsfɪər, ˈkɛm ə-)
Random House Webster's College Dictionary
the region of the atmosphere most characterized by chemical, esp. photochemical, activity, starting in the stratosphere and including the mesosphere and perhaps part of the thermosphere.
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ionosphere
(ɪˈɒn əˌsfɪər)
Random House Webster's College Dictionary
the region of the earth's atmosphere between the stratosphere and the exosphere, consisting of several ionized layers and extending from about 50 to 250 mi. (80 to 400 km) above the surface of the earth.
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ozone
(ozone)
Princeton's WordNet
a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation)
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