Convection currents are made possible by heat and pressure.
• It has been hypothesized by geologists that the movement of the tectonic plates is associated with the convection currents in the mantle of the Earth.
• The convection current illustrates the spread, rising, and sinking of gas, liquid, or molten substance resulting due to the application of heat.
• The solid crust of the Earth functions as an insulator for the hot interior of the planet. The molten rock below the crust in the mantle is magma.
• The extreme amount of pressure and heat within the Earth makes the hot magma flow in convection currents. These currents make the movement of the tectonic plates that forms the Earth's crust.
Thus, the correct answer is option b, that is, convection currents are made possible by heat and pressure.
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