During a supercontinent such as Pangea, a single global ocean would be formed hindering the cold polar sweater to sink to the seafloor and rise as warmer ocean currents.

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When a supercontinent forms, it can create a single global ocean which would inhibit the proper circulation of ocean currents. As a result, the cold polar water may not sink to the seafloor and rise as warmer currents, leading to large-scale climatic changes.

During a Supercontinent Such as Pangea, a Single Global Ocean