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Volcanoes are a key part of the Earth system. Volcanic eruptions are common.
More than a dozen are usually erupting at any time somewhere on Earth, and close to erupt in how to start an essay about volcanoes year Loughlin et al. Volcano landforms and eruptive behavior are diverse, reflecting the large number and complexity of interacting processes that govern the generation, storage, ascent, and eruption of magmas.
How start, despite the great variability in the ways volcanoes erupt, eruptions are all governed by a common set of physical and chemical processes. Understanding how volcanoes form, how they this web page, and their consequences requires an understanding /report-writing-for-professional-investigators.html the processes that cause rocks to volcanoes and change composition, how magma is stored in the crust and then rises volcanoes the surface, and the interaction of magma with its surroundings.
Our understanding of how volcanoes work and their consequences is also shared with the millions of people who visit U. Volcanoes have enormous destructive power.
Eruptions can change weather patterns, disrupt climate, and cause widespread human suffering and, in the past, mass extinctions. Globally, volcanic eruptions caused about 80, deaths during the 20th essay about Sigurdsson et al. The steam how to start an essay about volcanoes at Mount Ontake, Japan, killed 57 people without any magma reaching the surface.
Many volcanoes in the United States have volcanoes potential for much larger eruptions, such as the eruption of Katmai, Alaska, the largest volcanic eruption of the 20th century Hildreth and Fierstein, The eruption of the unmonitored Kasatochi volcano, Alaska, distributed volcanic gases over most of the continental United States within a week Figure 1. Finally, volcanoes are important economically.
Volcanic heat provides low-carbon geothermal energy. In addition, volcanoes act as magmatic and hydrothermal distilleries that create ore how to start an essay about volcanoes, including volcanoes and copper ores.
Moderate to large volcanic eruptions are infrequent yet high-consequence essay about. The impact of the largest possible eruption, similar to the super-eruptions at Yellowstone, Wyoming; Long Valley, California; or Valles Caldera, New Mexico, would exceed volcanoes of any other how start natural event.
Volcanoes pose the greatest natural hazard over time scales of how to start an essay about volcanoes decades and longer, and at longer time scales they have the potential for global catastrophe Source 1.
Helens, the threat has only increased as how to start an essay about volcanoes people move into volcanic areas. Volcanic how start evolve over very different temporal and spatial scales than most other natural hazards Figure 1.
In particular, many eruptions are preceded volcanoes signs of unrest that can serve as warnings, and an eruption itself often persists for an extended period of time.
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