Arrange the events in the correct order to describe how the magnetic field forms around Earth.

a - The electric currents create a magnetic field on Earth

b - A continuous flow of liquid iron creates electric currents inside Earth

c - Iron - rich magma heats up inside Earth

d - Convection currents form, cycling magma between the core and the crust

The correct sequence of events is : C, D, B, A.

Iron rich magma in the earth's core heats up because of radiation and the pressure exerted by the other layers of the earth. This heat in the crust trigger convection currents in the mantle. The magma closest to the core will be hotter and therefore less dense than other layers. Being less dense the layer will rise towards the crust, eventually becoming cooler and sinking back down in a circular motion.

The continued circular motion creates electric currents which then generates the magnetic field.

I think the order to this is: B, D, C and A.