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" ... Let’s recap a little. Earth is made up of various tectonic plates. Made of the upper mantle and the crust, these plates move around on the weaker part of the mantle, known as the asthenosphere. Although it was thought for some time that convecting currents in the mantle were responsible for dragging these plates around, it’s now generally agreed that another mechanism is responsible here: slab pull. ... "
" ... The asthenosphere is in this case the interval of plastic, less viscous fluid in between the lithosphere (Earth's crust) and rigid upper mantle. This mantle plume that creates Iceland injects hot, runny magma from the deeper mantle through the rigid upper mantle and into the runnier asthenosphere. At that point, some magma makes its way through Earth's crust to form Iceland and the rest splays out radially from the center like a water gun spraying a wall. ... "