Caused by the magma under the crust was soft pressure, insert a crack to the surface world. With strong eruptions or explosive intensification occurred and what makes a volcano explodes:
Caused by magma underneath the crust was compressed, insert the cracks to the surface world. The force of the eruption or explosion occurs. And what makes a volcano explosion.
Caused by magma under the crust is compressive pressure to insert the cracks to the earth's surface. The eruption or explosion force occurs. And what makes a volcanic eruption.