Question

What activates a convection current, starting the flow of a fluid?

Question 8 options:

cold temperatures at the north pole

heated liquids at Earth's surface


iron-rich rocks in the mantle

temperature differences in the mantle

Answer 1

Convection currents are activated by temperature differences within a fluid, which cause variations in density and result in the movement of the fluid. In the context of Earth's mantle, it is the **temperature differences in the mantle** that primarily drive convection currents. Heat from the Earth's interior causes the lower mantle to become less dense and rise, while cooler material sinks, creating a circulation pattern.

So, the correct answer is: **temperature differences in the mantle**.