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The four main types of volcanoes Where on Earth volcanoes will form What the different types of magma are Basics of volcanic rocks
What is a Volcano?

Hot magma, melted rock below Earth's crust, rises and collects in a magma chamber (1) deep below the surface. If the magma flows through a conduit (2) up to a vent (3) on the surface, then it may cause an eruption and form a volcano.

Gases, lava (4), and pyroclastic material (5) are erupted from volcanic vents. The mountain that forms from layers of lava and tephra is called a volcano (6). The word "volcano" comes from the name of a Roman god, Vulcan, who was the god of fire. Magma that solidifies inside a volcano can form dikes and sills (7).

Volcanoes are classified as active, dormant or extinct.

Information on Vulcan
Information on active, dormant, and extinct volcanoes
The magma chamber
The magma conduit
The vent
Lava
Pyroclastic material
The volcano
Dikes and sills