Oceanographers primarily study the ocean and its various components, including physical, chemical, biological, and geological aspects. Among the options provided, "gravity fields" could be related to oceanography as it pertains to the study of ocean currents and sea level variations influenced by gravitational forces. However, the other options (formation of groundwater, soil conservation, contours and formations) are more closely associated with fields like hydrology and environmental science rather than oceanography specifically.
In summary, "gravity fields" is the option that best relates to the studies conducted by oceanographers.
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