Manteel (geology)

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(Reguidit frae Mantle (geology))
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The structur o the Yird

The manteel is a pairt o a terrestrial planet or ither rocky body lairge eneuch tae hae differentiation bi density. The interior o the Yird, similar tae the ither terrestrial planets, is chemically dividit intae layers. The manteel is a layer atween the crust an the ooter core. Yird's manteel is a silicate rocky shell aboot 2,900 km (1,800 mi) thick[1] that constitutes aboot 84% o Yird's volume.[2] It is predominantly solit but in geological time it behaves lik verra viscous liquid. The manteel encloses the het core rich in airn an nickel, that occupies aboot 15% o Yird's vollum.[2][3] Past episodes o meltin an volcanism at the shallaer levels o the manteel hae produced a thin crust o creestallised melt products near the surface, upon which we leeve.[4] Information aboot structure an composeetion o the manteel aither result frae geopheesical investigation or frae direct geoscientific analyses on Yird manteel derived xenoliths.

Twa main zones are distinguished in the upper manteel: the inner asthenosphere componed o plastic flaein rock aboot 200 km thick,[5] an the lawermaist pairt o the lithosphere componed o rigid rock aboot 50 tae 120 km thick.[6] A thin crust, the upper pairt o the lithosphere, surroonds the manteel an is aboot 5 tae 75 km thick.[7]

In some places unner the ocean the manteel is actually exponed on the surface o the Yird.[8] Thare are an aa a few places on land whaur manteel rock haes been pushed tae the surface bi tectonic activity, maist notably the Tablelands region o Gros Morne Naitional Pairk in the Canadian province o Newfoundland an Labrador.

References[eedit | eedit soorce]

  1. Mantle: Schlumberger Oilfield Glossary. Retrieved on 2013-05-11.
  2. 2.0 2.1 Robertson, Eugene (2007). "The interior of the earth". USGS. Retrieved 2009-01-06. 
  3. Core: Schlumberger Oilfield Glossary. Retrieved on 2013-05-11.
  4. "The structure of the Earth". Moorland School. 2005. Retrieved 2007-12-26. 
  5. Asthenosphere: Schlumberger Oilfield Glossary. Retrieved on 2013-05-11.
  6. Lithosphere: Schlumberger Oilfield Glossary. Retrieved on 2013-05-11.
  7. Crust: Schlumberger Oilfield Glossary. Retrieved on 2013-05-11.
  8. Mission to Study Earth's Gaping 'Open Wound'. LiveScience. Retrieved on 2013-05-11.