Sometimes one plate is pushed down into the mantle below the crust and melts. This melted material with the magma can then create a volcano. There are also different kinds of volcanoes. The differences are the way they are made, the type of lava and the kind of volcanic material. The most common are the shield, the dome, the cinder cone and the stratovolcano.
Shield volcanoes are the type found in Hawaii.
They are in the shape of wide, sloping mounds. The lava from shield volcanoes is liquid and flows from the crater and the sides of the volcano. The most dangerous volcanoes are the dome volcanoes . The volcano in Lassen Peak, California, is a dome volcano that erupted in 1915. The lava from dome volcanoes is a thick lava that forms cones shaped like steep domes.