A volcano is a mountainous vent in
the Earth’s crust. When a volcano erupts, it spews out lava, ashes,
and hot gases from deep inside the Earth. Magma is molten rock within
the Earth’s crust. When magma erupts through the Earth’s surface
it is called lava. Complex systems such as volcanoes transfer energy
and volcanic fluids through the Earth, which leads to volcanic activity.
People who study volcanoes are called volcanologists. A volcano forms
and erupts when a magma chamber under the ground gets so full it explodes!
When the magma explodes out of the volcano it forms streams of lava.
When the magma comes out of a volcano it becomes lava. Volcanoes
are very dangerous when they erupt. Some of the volcanoes on the
Earth are in Hawaii.