scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 2,224
I Introduction Volcano defined is a mountain or hill formed by the accumulation of materials erupted through one or more openings called volcanic vents in the earths surface The term volcano can also refer to the vents themselves Most volcanoes have steep sides but some can be gently sloping mountains or even flat tablelands plateaus or plains The volcanoes above sea level are the best known but the vast majority of the worlds volcanoes lie beneath the sea formed along the global oceanic ridge systems that crisscross the deep ocean floor According to the Smithsonian Institution 1511 above-sea volcanoes have been active during the past 10000 years 539 of them erupting one or more times during written history On average 50 to 60 above-sea volcanoes worldwide are active in any given year about half of these are continuations of eruptions from previous years and the rest are new Mount St Helen 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 flows 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 II Volcano Formation All volcanoes are formed by the accumulation of magma which is molten rock that forms below the earths surface Magma can erupt through one or more volcanic vents which can be a single opening a cluster of openings or a long crack called a fissure vent It forms deep within the earth generally within the upper part of the mantle which is one of the layers of the earths crust or less commonly within the
@Kibin is a lifesaver for my essay right now!!
- Sandra Slivka, student @ UC Berkeley
Wow, this is the best essay help I've ever received!
- Camvu Pham, student @ U of M
If I'd known about @Kibin in college, I would have gotten much more sleep
- Jen Soust, alumni @ UCLA