Volcanoes Volcanoes form when magma rises through cracks in the Earth’s surface. Pressure builds up inside the Earth. When this pressure is released, magma explodes to the surface causing a volcanic eruption. The lava from the eruption cools to form new crust. Over time, the rock builds up and a volcano forms. Volcanoes occur at destructive and constructive boundaries. Volcanoes… Continue reading Volcanoes and the hazards they bring!