Geography • Physical GeographyEasy
In oceanography, what does the term 'thermocline' refer to?
A. A layer of water where salinity changes abruptly with depth
B. A zone in the ocean characterized by a rapid change in temperature with depth✓ Correct Answer
C. The boundary where deep ocean currents meet surface winds
D. The zone of maximum biological productivity near the continental shelf
💡 Solution & Explanation
A thermocline is a distinct transitional layer in oceans and lakes where water temperature drops rapidly with increasing depth, separating the warm mixed surface layer from the cold deep waters. Unlike haloclines which denote rapid salinity changes, thermoclines act as strong thermal barriers affecting vertical mixing and marine life distribution. This layer typically lies beneath the photic zone and prevents significant heat exchange between surface and deep ocean currents.
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