Final answer:
Hot magma rises while cooler magma sinks in convection currents in the mantle.
Step-by-step explanation:
In convection currents in the mantle, hot magma rises while cooler magma sinks. The mantle is the layer of the Earth between the crust and the core. Convection currents in the mantle are driven by the heat from the core, causing hot magma to rise and cooler magma to sink. This movement of magma is responsible for plate tectonics, which shape the Earth's surface.