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Rheid
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<h2 id="types-of-rheids">Types of rheids</h2> <p>Almost any type of <a href="/facts/Rock_(geology)/FXCJkmop">rock</a> can behave as a rheid under appropriate conditions of <a href="/facts/Temperature/QyGe4gmj">temperature</a> and <a href="/facts/Pressure/eyc37GRG">pressure</a>. For example, the <a href="/facts/Earth/HLLmDfj0">Earth</a>'s <a href="/facts/Mantle_(geology)/RpDdtjCr">mantle</a> undergoes <a href="/facts/Convection/E8vsCPhu">convection</a> over long time-scales. As the mantle supports the propagation of <a href="/facts/Seismic_waves/1JTeLfac">shear waves</a>, it may be deduced that it is a solid and, therefore, behaving as a rheid when it undergoes said convection. <a href="/facts/Granite/G2evuVKo">Granite</a> has a measured viscosity at <a href="/facts/Standard_temperature_and_pressure/JhJv9KFJ">standard temperature and pressure</a> of about 4.5×1019 Pa·s <a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> so it should be considered a rheid. Similarly <a href="/facts/Halite/9xEEKKT8">halite</a>, the mineral form of <a href="/facts/Sodium_chloride/MWcXl3Mb">table salt</a>, is a geological material that behaves as a rheid over relatively short time-periods. As salt is buried by other types of <a href="/facts/Sedimentary_rock/HQDCjrco">sediments</a>, it will often flow laterally towards regions of lower confining <a href="/facts/Stress_(physics)/ErAXDbbd">stress</a>. Through this mechanism, <a href="/facts/Salt_dome/RsPm1A8y">salt domes</a> and other structures may form. In some areas, such as the <a href="/facts/Gulf_of_Mexico/bGE5s57G">Gulf of Mexico</a>, these structures often serve as <a href="/facts/Petroleum_reservoir/wYoSQmGN"> traps</a> for <a href="/facts/Petroleum/IQV0bHVd">petroleum</a> and <a href="/facts/Natural_gas/9MYQ7NAP">natural gas</a>. </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Kumagai, Naoichi; Sadao Sasajima; Hidebumi Ito (15 February 1978). "Long-term Creep of Rocks: Results with Large Specimens Obtained in about 20 Years and Those with Small Specimens in about 3 Years". Journal of the Society of Materials Science (Japan). 27 (293). Japan Energy Society: 157–161. doi:10.2472/jsms.27.155. Archived from the original on 2017-03-03. Retrieved 2008-06-16. <a href="https://www.jstage.jst.go.jp/article/jsms1963/27/293/27_293_155/_article/-char/ja/" target="_blank">https://www.jstage.jst.go.jp/article/jsms1963/27/293/27_293_155/_article/-char/ja/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>