Because the thermocline is permanent in tropical oceans,little vertical mixing occurs,resulting in low productivity.

Name: Because the thermocline is permanent in tropical oceans,little vertical mixing occurs,resulting in low productivity.
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The permanent thermocline in tropical oceans acts as a barrier to vertical mixing, which limits the upward movement of nutrients from deeper waters to the surface, resulting in lower productivity compared to regions where vertical mixing is more prevalent.

Because the Thermocline Is Permanent in Tropical Oceans,little Vertical Mixing