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" ... Hawaii's volcanoes are hotspots, where the mantle magma continually upwells and burns a hole through Earth's oceanic crust. Oceanic crust, in composition, is very similar to what we would find in the upper mantle with high olivine concentrations. ... "
" ... The Hawaiian Island chain was and still is formed by the Hawaiian hotspot. This is a strange phenomenon where molten rock upwells from the upper mantle in a specific spot, causing it to 'burn' through the overlying lithosphere and erupt lava onto the surface of the Earth. ... "
" ... The Yellowstone supervolcano is a result of a hotspot similar to the one that formed the Hawaiian Island chain. The Yellowstone hotspot is a result of mantle convection of magma that upwells through the lithosphere (Earth's crust) at Yellowstone. As an analogy, imagine a match held underneath the middle of a piece of cardboard. Eventually, the match would burn its way through the cardboard, similar to the hotspot burning its way through the lithosphere. ... "