convection currents is not in our dictionary (yet). Here's what it could mean:

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noun

The circulatory movement in a fluid, such as air or water, created by the rising of heated, less dense material and the sinking of cooled, denser material, which results in the transfer of heat.

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As the molten iron and nickel slowly cool, they form swirling convection currents in the outer core.

From Science Daily ● Oct. 12, 2025

The displaced cold air falls, and the process repeats, setting up so-called convection currents.

From Scientific American ● Jul. 1, 2023