*Remember, volcanoes are produced when lava finds its way to the surface from a magma chamber deep underground.
* Some volcanoes form where the crust splits apart. Here runny lava flows out and makes gently sided volcanoes that erupt much of the time.
* Other volcanoes form where two great slabs of the Earth's crust push together. These volcanoes are made of sticky lava and they erupt with great violence.
