What is a volcano?
A volcano is a sometime a mountain and other times just an explosion out of the ground that is formed by convergent plates colliding with each other or an oceanic and continental plates colliding. It has a magma chamber that holds the magma. Magma rises into the magma chamber. Then up the vent. Next it will get to the surface and cause an eruption. When the magma comes up it is known as lava but its the same substance as magma just above ground.