scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 1,965
A volcano is a mountain or hill formed by the accumulation of materials erupted through one or more openings in the earths 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 volcanos 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 or a long crack called a fissure vent It forms deep within the earth generally within the upper part of the mantle one of the layers of the earths crust Or less commonly within the base of the earths crust High temperatures and pressures are needed to form magma Volcanic activity ranges from emission of gases non-explosive lava emissions to extremely violent explosive bursts that may last many hours The types of eruptions determine 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