How Do Volcanoes Erupt? | U.S. Geological Survey - USGS.gov
Pressure builds up until the gases escape violently and explode. A good example is the eruption of Washington’s Mount St. Helens. In this type of eruption, the magma blasts into the air and breaks apart into pieces called tephra.
What Causes a Volcano to Erupt? | Britannica
Volcanoes erupt because of the way heat moves beneath Earth’s surface. Heat is conveyed from the planet’s interior to its surface largely by convection—the transfer of heat by movement of a heated fluid.
Why do volcanoes erupt? | Earth | EarthSky
2015年8月20日 · Volcanoes that are located in subduction zones – where Earth’s moving plates collide, causing one plate to sink under the other – receive a steady injection of new molten rock into the magma...
Volcanic eruption | Description, History, Mythology, & Facts
A volcanic eruption is an eruption of molten rock, hot rock fragments, and hot gases through a volcano, which is a vent in a planet’s or satellite’s crust. Volcanic eruptions can cause disastrous loss of life and property.
Volcanoes 101 | National Geographic - YouTube
Learn about the major types of volcanoes, the geological process behind eruptions, and where the ... About 1,500 active volcanoes can be found around the world.
Volcano - Wikipedia
The form and style of an eruption of a volcano is largely determined by the composition of the lava it erupts. The viscosity (how fluid the lava is) and the amount of dissolved gas are the most important characteristics of magma, and both are largely determined by …
What Causes a Volcano to Erupt, and How Do ... - Scientific American
1999年11月29日 · Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a...
About Volcanoes | U.S. Geological Survey - USGS.gov
How do volcanoes erupt? Illustration of the basic process of magma formation, movement to the surface, and eruption through a volcanic vent. Molten rock below the surface of the Earth that rises in volcanic vents is known as magma, but after it erupts from a volcano it is called lava.
Volcano | Definition, Types, & Facts | Britannica
2024年10月7日 · 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 …
Volcanoes - Education | National Geographic Society
2023年10月19日 · A volcano is an opening in a planet or moon’s crust through which molten rock, hot gases, and other materials erupt. Volcanoes often form a hill or mountain as layers of rock and ash build up from repeated eruptions. Volcanoes are classified as …