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volcano during eruption click to hear : volcano during eruption

Eruption of magmatic matter (molten rock, ash, gas) from the upper mantle; it can last several years.
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ash layer geyser lava flow fumarole sill dike magma magma chamber laccolith lava layer side vent main vent volcanic bomb cloud of volcanic ash crater

ash layer click to hear : ash layer

Ash and lava form the layers that shape the volcano over time.

geyser click to hear : geyser

Hot water spring that ejects sporadic jets of water and vapor.

lava flow click to hear : lava flow

Lava mass pouring from a volcano at average speeds of 300 meters per hour; it can reach temperatures as high as 1,200°C.

fumarole click to hear : fumarole

Regular emission of gas from a fissure on the Earth’s surface.

sill click to hear : sill

Layer of magma that has solidified between the layers of the Earth’s crust; it is about 10 meters thick and several kilometers long.

dike click to hear : dike

Mass of magma that enters the Earth’s crust and then solidifies in the form of bladelike shafts that are vertical or oblique to the layers of the Earth.

magma click to hear : magma

Molten rock and gas under very high pressure that can reach extremely high temperatures.

magma chamber click to hear : magma chamber

Pocket where magma accumulates before rising to the surface.

laccolith click to hear : laccolith

Mass of magma that enters the Earth’s crust and then solidifies, causing a deformation on the Earth’s surface.

lava layer click to hear : lava layer

Layer of volcanic rock formed by cooled lava.

side vent click to hear : side vent

Small rise that appears on the side of the volcano and is fed by the main vent.

main vent click to hear : main vent

Conduit along which lava and other volcanic ejecta rise.

volcanic bomb click to hear : volcanic bomb

Mass of magma ejected high into the air where it solidifies; it can be very large.

cloud of volcanic ash click to hear : cloud of volcanic ash

Ash is formed of particles less than 2 mm in diameter; it is composed of pulverized magma and ground rock.

crater click to hear : crater

Depression whose center features a chimney through which lava, gas and volcanic ejecta escape.