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OpenStudy (anonymous):
The four main systems of the Earth are A. geology, meteorology, oceanography, and chemistry. B. geosphere, atmosphere, hydrosphere, and aerosphere. C. aromatherapy, biology, chemistry, and physical properties. D. geosphere, atmosphere, hydrosphere, and biosphere.
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OpenStudy (anonymous):
the answer is D. hope this helped! (:
OpenStudy (anonymous):
D is the correct answer hope this helps :)
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