Oceanographers study the patterns and chemical properties in the
ocean. Some types of oceanography include physical oceanography,
geological oceanography, chemical oceanography, and biological
oceanography.
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geological oceanography
biological oceanography
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Oceanography, also called oceanology or marine science.
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Hydrology is the study of the Earth's water.
Hydrology includes geohydrology, limnology, oceanography,
chemical oceanography, physical oceanography, biological
oceanography, geological oceanography and paleoceanography, amongst
other Earth Sciences.