causes of volcanoes

• one way that volcanoes are caused is by constructive plate boundaries. the plates move appart and the magma rises up.
• constructive plate volcanoes usually arent very explosive and are under water.
• another way that volcanoes are caused is by destructive plate boundaries which is when plates move towards eachother. the dense oceanic plate is forced under the lighter continental plate, into the mantle where it melts. this molten rock rises up to the surface through cracks in the rocks.
• destructive plate volcanoes are usually very explosive because they are mixed with gases