Vocabulary 6 - Unit 4
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atmosphere: the whole mass of air surrounding the earth
noun. The atmosphere becomes increasingly more unstable.
biosphere: the part of the world in which life can exist
noun. Earth's biosphere has significantly altered its atmosphere.
geosphere: one of the shells or spherical layers within the earth delimited above and below by discontinuities
noun. Organic carbon stored in the geosphere can remain there for millions of years.
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