Volcanic terrain in Iceland with fumarole mud pots at famous Hverir, aerial

volcanic terrain iceland fumarole mud pots famous hverir aerial hverarond namaskare namaskard volcano geology extreme crater desert formation landscape scenic active rising wilderness field arid sulfur plateau top down directly above mud pools holes natural arctic acidic soil infertile gas dirt thermal barren surface minerals hot spring geothermal earth ground land sulphur energy topography