Identify one reason why volcanoes occur at constructive (divergent) plate boundaries.
Plates slide laterally past each other, creating intense frictional heat which melts the crust.
Tectonic plates pull apart, causing magma to rise from the mantle to fill the gap.
An oceanic plate subducts beneath a continental plate, melting into the asthenosphere.
A stationary plume of hot magma burns a hole through the middle of a moving plate.
