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

Answer 1

The option that activates a convection current starting the flow of a fluid is:

D: temperature differences in the mantle.

Convection currents in the Earth's mantle are driven by temperature differences, which cause denser, cooler material to sink and less dense, heated material to rise, resulting in the movement of the fluid (the mantle).