Volcanoes Risks and Benefits

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I. Introduction …………………………… 1 II. Body …………………………… 2 a. Definition …………………………… 2 b. Kinds of volcano …………………………… 2 c. Types of eruption …………………………… 3 d. Risk …………………………… 4 e. Benefits …………………………… 11 a. Tourism …………………………… 11 b. Environment …………………………… 13 III. Conclusion …………………………… 15 IV. Bibliography …………………………… 17 Introduction The term volcano can either mean the vent from which magma erupts to the surface, or it can refer to the landform created by the solidified lava and fragmental volcanic debris that accumulate near the vent. One could say, for example, that large lava flows are erupted from Kilauea volcano in Hawaii, the world volcano here…show more content…
Pelean eruptions are similar to vulcanian eruptions but have even more viscous lava; domes from over the vents, and ash flows commonly accompany the dome fountais. Plinian eruptions, also known as 'Vesuvian eruptions', are volcanic eruptions marked by their similarity to the eruption of Mount Vesuvius in AD 79 (as described in a letter written by Pliny the Younger, and which killed his uncle Pliny the Elder). Plinian eruptions are marked by columns of gas and volcanic ash extending high into the stratosphere, a high layer of the atmosphere. The key characteristics are ejection of large amount of pumice and very powerful continuous gas blast eruptions. Risks Volcanoes release volcanic hazards that may cause the life of human kind to be in danger. These volcanic hazards are Pyroclastic Density Currents (pyroclastic flows and surges), Lahars, Structural Collapse: Debris flow-Avalanches, Dome Collapse and the formation of pyroclastic flows and surges, Lava flows, Tephra fall and ballistic projectiles, volcanic gas, Tsunamis and Volcanic Lightning Pyroclastic density currents are are gravity-driven, rapidly moving, ground-hugging mixtures of rock fragments and hot gases. This mixture forms a dense fluid that moves along the ground with an upper part that is less dense as particles fall toward the ground. The behavior of the fluid depends upon the solids
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