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Stage 1
The heat of the earth’s core causes magma to heat up, become lighter and rise.
Stage 2
When the hot magma reaches the underneath of the crust it spreads out in all directions, dragging the crust with it.
Stage 3
The magma then cools slightly, as it’s farthest from the core. This makes it heavier.
Stage 4
The heavier magma sinks back down towards the core, where it is heated again.
Stage 5
the cycle is repeated again and again in a circular motion, causing convection currents.
