volcanic eruptions or eruptions can cause catastrophes, not only in areas close to eruptions. The dangers of volcanic ash are against aviation jets in particular where volcanic ash can damage turbines from jet engines. Large eruptions can affect the temperature because smoke and sulfuric acid spewed eruptions can block the sun and cool the bottom of Earth's atmosphere like the troposphere, but the material can also absorb heat emitted from the earth to heat the stratosphere. Historically, volcanic winter has resulted in severe famine.
Furthermore, the term volcano is also used to name the phenomenon of formation of ice volcanoes or icebergs and mud volcanoes or mud volcanoes. Common icebergs occur in areas with snowy winters, while mud volcanoes can be seen in the popular Kuwu, Grobogan, Central Java region as Bledug Kuwu.
volcanoes in general are terms that can be defined as a system of hot fluid channels (rocks in liquid or lava) extending from a depth of about 10 km beneath the earth's surface to the surface of the earth, including deposits of accumulated materials removed at the time of eruption. A volcano is a natural formation of fractions occurring in the crust of a planet-massed celestial body, such as Earth, where the fracture causes hot lava, volcanic ash and gas to escape from the magma chamber beneath the earth's surface.
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