Which explanation best describes convection currents in the earths mantle

Answer 1

Convection currents in the Earth's mantle occur due to the heat generated from the core. The inner core of the Earth is extremely hot, causing the mantle to be heated from below. As the mantle gets heated, the material becomes less dense and rises towards the surface. Once it reaches the surface, it cools down and becomes denser, causing it to sink back towards the core. This continuous cycle of rising and sinking movement creates convection currents in the mantle. These convection currents transfer heat from the core towards the surface and play a crucial role in driving tectonic plate movement on the Earth's surface.