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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
Types of volcanic materials. Three basic kinds of materials may erupt from a volcano: 1) lava, (2) rock fragments, and (3) gas. The material that erupts depends chiefly on how sticky or fluid a volcano's magma is.Lava is the name for magma that has reached the earth's surface.omposite volcanoes are formed when both lava and tephra erupt from a central vent. The materials pile up in alternate layers around the vent and form a towering, cone-shaped mountain. Composite volcanoes include Japan's Mount Fuji; Mayon Volcano in the Philippines; and Italy's Vesuvius.