About Volcanoes | U.S. Geological Survey - USGS.gov
Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface. Volcanic eruptions can last days, months, or even years. What is a volcano? Redoubt volcano with minor ash eruption. Photograph taken during observation and gas data collection flight by AVO staff March 30, 2009.
Anatomy of a Volcano - U.S. National Park Service
Jul 5, 2023 · Volcanoes are both the vents where molten rock material and volcanic gases are erupted from within Earth’s interior, and the cones and mountains built up around those vents. But beyond this simple definition, volcanoes are incredibly diverse …
Fissure vent - Wikipedia
A fissure vent, also known as a volcanic fissure, eruption fissure or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is often a few metres wide and may be many kilometres long.
Fumarole - Wikipedia
A fumarole (or fumerole) [1] is a vent in the surface of the Earth or another rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids.
Volcano | Definition, Types, & Facts | Britannica
Oct 7, 2024 · Volcano, vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. The term volcano can also refer to the landform created by the accumulation of solidified lava and volcanic debris near the vent.
Vents | Volcano World | Oregon State University
Vents, of course, are the locations from which lava flows and pyroclastic material are erupted. Their forms and orientations can be used to determine many characteristics of the eruption with which they were associated.
Anatomy of a Volcano | NOVA | PBS
Nov 12, 2002 · What are volcanic vents, dikes, and fissures? In this anatomy of a volcano, explore the basic geological features of a volcano such as Mt. St. Helens as well as the deadly materials released...
Types of Volcanic Vents - Owlcation
Dec 28, 2023 · Volcanic vents are fractures on the summit of a volcano through which lava is ejected. There are various types of volcanic vents. However, all vents connect to the magma chamber, which is a pool of hot molten rock, to the vent on top of a volcano.
Volcano facts and types of volcanoes - Live Science
Mar 3, 2022 · A volcano on Earth is a vent or fissure in the planet's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products.
Volcanic Eruptions - Volcanoes, Craters & Lava Flows (U.S.
A volcanic eruption is the expulsion of gases, rock fragments, and/or molten lava from within the Earth through a vent onto the Earth’s surface or into the atmosphere. Illustration of the basic process of magma formation, movement to the surface, and eruption through a volcanic vent.