One of the most active volcanic areas in the world is Iceland: in addition to craters which have been dormant since time memorial, the island has some thirty active volcanoes.
Iceland possesses other volcanic features, such as thermal springs and solfatara (which emit sulphur and water vapour gases); the most notable are the geysers which are jets of water at a high temperature.
The Icelanders have taken advantage of these hot springs: they have directed them into a system of pipes which heat homes, swimming pools and greenhouses. Since 1943 the whole city of Reykjavik has thus been able to solve its heating problems.
Picture Credit : Google