Their movement is driven by the convection currents in the magma.
A convection current is caused by the expansion of a liquid or gas due to its rise in temperature.
But eventually this tremendous land mass began to break up, as the convection currents formed a new pattern.
Once at the top, the large particle will stay there because the convection currents are too narrow to sweep it down along the wall.
Would the air underneath, cool air, not heat up and cause a convection current?
There is no question that convection currents move small and even large structures.
This is because dead air spaces do not allow the formation of convection currents.
The bobble spent a few years following convection currents around inside.
Rising convection currents occur where two plates are moving away from each other.
I had assumed convection currents would help transfer more of the heat.