which factor activates a convention current starting the flow of a fluid A cold temperatures at the north pole, B temperature differences in the mantle, C iron rich rocks in the mantle, D heated liquids at the earth surface

Answer 1

The factor that activates a convection current starting the flow of a fluid is B) temperature differences in the mantle.

Convection currents are driven by temperature variations within a fluid, which cause changes in density. In the case of the Earth's mantle, hotter, less dense material rises, while cooler, denser material sinks, creating a cycle that drives mantle convection and influences tectonic movements.