How are convection currents important in the earth system?
one way is that convection currents are thought to be the driving force of plate tectonics that shape and reshape the earth's crusts forming oceans, mountains and continents.
Convections currents in the earth's mantle are thought to be the driving force of plate tectonics.
Where the hot magma is brought near the surface by the convection currents a divergent boundary is created. The divergent boundaries form new oceans and widen existing oceans. They also form volcanos, islands and undersea mountain ranges.
Where the magna is carried back down into the mantle convergent boundaries are formed. These boundaries form subduction zones, earthquakes, mountains and again volcanos.