The gas which does not come out from underground in volcanic eruption
Answers
Answer:
Explanation:
methane is a type of gas not produce by volcanic eruptions
Answer:
Concept:
A volcano is an opening or crack in the earth's surface that allows magma (hot liquid and semi-liquid rock), volcanic ash and gases to escape.
Find:
The gas which does not come out from underground in volcanic eruption
Given:
The gas which does not come out from underground in volcanic eruption
Explanation:
A volcano is an opening or crack in the earth's surface that allows magma (hot liquid and semi-liquid rock), volcanic ash and gases to escape. They usually occur where tectonic plates come together or separate, but they can also occur in the middle of plates due to volcanic hot spots. A volcanic eruption is when lava and gas are released from a volcano, sometimes explosively. The most dangerous type of eruption is called a "hot avalanche," which is when freshly erupted magma flows down the sides of a volcano. They can travel fast and reach temperatures of up to 1200 degrees Fahrenheit. Other hazards include falling ash and lahars (flows of mud or debris). Volcanoes often cause population displacement and food shortages.
Volcanologists have distinguished several types of volcanic eruptions - during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks) and various gases are forced out of a volcanic vent or fissure. These are often named after famous volcanoes where this type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may exhibit an entire sequence of types all in one series of eruptions.
• Igneous eruptions are the best observed type of eruption. They involve the decompression of gas in the magma, which propels it forward.
• Phreatic eruptions are driven by superheating of steam through contact with magma. This type often shows no magmatic release, instead causing granulation of existing rock.
• Phreatomagmatic eruptions are driven by the compression of gas within the magma, which is the exact opposite of the process that drives magmatic activity.
Within these broadly defined eruptive types are several subtypes. The weakest are Hawaiian and submarine, followed by Strombolian, followed by volcanic and Surtseyan. The more powerful eruption types are the Pelean eruptions, followed by the Plinian eruptions; the strongest eruptions are called Ultra Plinian. Subglacial and phreatic eruptions are defined by their eruptive mechanism and differ in strength. An important measure of eruptive power is the Volcanic Explosiveness Index (VEI), an ordinal scale ranging from 0 to 8 that often correlates with eruption types.
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