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- Q120005 subject Q2945759.
- Q120005 subject Q7415177.
- Q120005 subject Q8482456.
- Q120005 abstract "Mantle convection is the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface. The Earth's surface lithosphere, which rides atop the asthenosphere (the two components of the upper mantle), is divided into a number of plates that are continuously being created and consumed at their opposite plate boundaries. Accretion occurs as mantle is added to the growing edges of a plate, associated with seafloor spreading. This hot added material cools down by conduction and convection of heat. At the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of subduction usually at an ocean trench.This subducted material sinks to a depth of 660 kilometres (410 mi) in the Earth's interior where it is impeded from sinking further, possibly due to a phase change from spinel to silicate perovskite and magnesiowustite, an endothermic reaction.The subducted oceanic crust triggers volcanism, although the basic mechanisms are varied. Volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.Secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension and mantle plumes.It is because the mantle can convect that the tectonic plates are able to move around the Earth's surface.Mantle convection seems to have been much more active during the Hadean period, resulting in gravitational sorting of heavier molten iron, and nickel elements and sulphides in the core, and lighter silicate minerals in the mantle.".
- Q120005 thumbnail Earth-crust-cutaway-numbered.svg?width=300.
- Q120005 wikiPageWikiLink Q101949.
- Q120005 wikiPageWikiLink Q104460.
- Q120005 wikiPageWikiLink Q104698.
- Q120005 wikiPageWikiLink Q119253.
- Q120005 wikiPageWikiLink Q152827.
- Q120005 wikiPageWikiLink Q160329.
- Q120005 wikiPageWikiLink Q166257.
- Q120005 wikiPageWikiLink Q17009773.
- Q120005 wikiPageWikiLink Q176318.
- Q120005 wikiPageWikiLink Q178977.
- Q120005 wikiPageWikiLink Q191310.
- Q120005 wikiPageWikiLink Q203522.
- Q120005 wikiPageWikiLink Q215920.
- Q120005 wikiPageWikiLink Q221205.
- Q120005 wikiPageWikiLink Q22998485.
- Q120005 wikiPageWikiLink Q2945759.
- Q120005 wikiPageWikiLink Q3069735.
- Q120005 wikiPageWikiLink Q677.
- Q120005 wikiPageWikiLink Q7415177.
- Q120005 wikiPageWikiLink Q744.
- Q120005 wikiPageWikiLink Q7465774.
- Q120005 wikiPageWikiLink Q7950.
- Q120005 wikiPageWikiLink Q8072.
- Q120005 wikiPageWikiLink Q83296.
- Q120005 wikiPageWikiLink Q8482456.
- Q120005 wikiPageWikiLink Q878045.
- Q120005 wikiPageWikiLink Q918227.
- Q120005 type Thing.
- Q120005 comment "Mantle convection is the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface. The Earth's surface lithosphere, which rides atop the asthenosphere (the two components of the upper mantle), is divided into a number of plates that are continuously being created and consumed at their opposite plate boundaries.".
- Q120005 label "Mantle convection".
- Q120005 seeAlso Q179635.
- Q120005 depiction Earth-crust-cutaway-numbered.svg.