The phrase that explains the arrows is how convection currents move in Earth’s interior.
What is convection current?
The convection current is the process of movement of the heat from one place to another.
It is a single or multiphase flow of fluid due to body force and heterogeneity.
The convection current happens when the fluid is heated from the bottom and cooling from the upside.
Thus, the correct option is a, how convection currents move in Earth’s interior.
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