Volcanic Gas
Volcanic gases include a variety of substances given off by active (or, at times, by dormant) volcanoes. These include gases trapped in cavities (vesicles) in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating directly from lava or indirectly through ground water heated by volcanic action.
The sources of volcanic gases on Earth include:
- primordial and recycled constituents from the Earth's mantle,
- assimilated constituents from the Earth's crust,
- groundwater and the Earth's atmosphere.
Substances that may become gaseous or give off gases when heated are termed volatile substances.
Read more about Volcanic Gas: Magmatic Gases and High-temperature Volcanic Gases, Low-temperature Volcanic Gases and Hydrothermal Systems, Non-explosive Volcanic Gas Release, Composition, Sensing, Collection and Measurement, Volcanic Gases and Volcano Monitoring, Hazards
Famous quotes containing the words volcanic and/or gas:
“Pity the planet, all joy gone
from this sweet volcanic cone;”
—Robert Lowell (1917–1977)
“... when I awake in the middle of the night, since I knew not where I was, I did not even know at first who I was; I only had in the first simplicity the feeling of existing as it must quiver in an animal.... I spent one second above the centuries of civilization, and the confused glimpse of the gas lamps, then of the shirts with turned-down collars, recomposed, little by little, the original lines of my self.”
—Marcel Proust (1871–1922)