What is a volcano?. A volcano is an opening, or vent, in the Earth’s crust through which magma and gases are expelled. Where do volcanoes form?. A large number of volcanoes lie directly on tectonic plate boundaries where it is possible for magma to form and rise to the surface .
A volcano is an opening, or vent, in the Earth’s crust through which magma and gases are expelled.
Volcanic eruptions can cause profound changes in climate, but they are best known for their volcanic landforms.
A crater is a funnel shaped pit near the top of the central vent of a volcano.
A large, semicircular depression that forms when the magma chamber below a volcano partially empties and causes the ground to sink.
A wide flat landform that results from repeated non-explosive eruptions of lava that spread over a large area