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Heat from extinct volcano could be piped into Dutch homes
(www.theguardian.com)
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this post was submitted on 28 Jul 2023
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I think it means that the earth’s crust is a bit thinner there, so it is easier to tap into the geothermal heat below the crust. The deeper you go, the hotter it gets.
no vulcanoes aren't a location with thinner crust, but a place where a bubble of magma is stuck in the crust, because of a hotspot or because of subduction or other reasons. When the pressure is too high, or there are forces that push the magma upwards, it "leaks" some magma, some times violently, some times no, like in Hawaii. An inactive volcano probably has a bubble without enough pressure to release it, and that has no upward forces nor a way of building more pressure.