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Essay on VOLCANO | ||
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This is the first 1,000 characters of 1993 words (7.97 pages) in the essay titled VOLCANO A volcano is a mountain or hill formed by the accumulation of materials erupted through one or more openings in the earth s surface. Most volcanoes have steep sides but sometimes they can slope down or even be flat. The volcanoes above sea level are the best known, but the most volcanoes lie beneath the sea, formed along the global oceanic ridge. Volcanic eruptions in populated regions are a significant threat to people, property, and agriculture. The danger is mostly from fast-moving, hot flows of explosively erupted materials, falling ash, and highly destructive lava flows and volcanic debris. In addition, explosive eruptions, even from volcanoes in unpopulated regions, can eject ash high into the atmosphere, creating drifting volcanic ash clouds that pose a serious hazard to airplanes.Lava is magma that breaks the surface and erupts from a volcano. If the magma is very fluid, it flows rapidly down the volcano s slopes. Lava that is more sticky and less fluid moves slower. Lava flows that have a continuous, smooth, ropy, or billowy surface are called pahoehoe flows. But aa flows have a jagged surface composed of loose, irregularly shaped lava chunks. Once cooled, pahoehoe forms smooth rocks, while aa forms jagged rocks. The words pahoehoe and aa are Hawaiian terms that describe the texture of the lava All volcanoes are formed by the accumulation of. Magma can erupt through one or more volcanic vents, which can be a single opening, a cluster of openings, o... |
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Keywords: lava flows, explosive eruptions, layers of the earth, volcanoes, types of eruptions, pahoehoe flows, magma, explosive bursts, volcano, ash, smooth rocks, aa, accumulation, ropy, volcanic ash clouds, volcanic debris, volcanic vents, fluid moves, earths crust, oceanic ridge