In a convection current warm fluid sinks to replace cool fluid warm fluid is more dense, and therefore, rises cool fluid is more dense, and therefore, sinks heat flows from cooler areas to warmer areas ill mark you brainliest

The given blank can be filled with cool fluid is denser, and thus, sinks.  

The convection currents are the outcome of differential heating. The less dense, that is, lighter warm substances rises, while the denser, that is, heavier cool substance sinks. It is this movement that generates patterns of circulation called convection currents, in water, in the atmosphere, and in the mantle of the Earth.  

Option (c) is the correct answer.

Explanation:

Convection is defined as the process in which a fluid (liquid or gas) when heated then more dense (cooler) substance sinks ate the bottom whereas less dense (hotter) substance will rises at the top.

This intermixing of the substances tends to generate convection currents and this process is known as convection.

Thus, we can conclude that in a convection current cool fluid is more dense, and therefore, sinks.

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