Minele de sulf sapate in craterul vulcanului indonezian Kawah Ijen (2.600 m inaltime), din Java de Est, sunt absolut spectaculoase - o demonstreaza Oliver Grunewald, fotograful care s-a aventurat in craterul adanc de 200 de metri. Gazele emanate de vulcan sunt canalizate printr-o retea de tevi de ceramica, care condenseaza sulful topit. Intre 70 si 100 de kg zilnic extrage un miner de aici, operatiune pentru care este platit cu numai 13 dolari americani pe zi. Kawah Ijen este un stratovulcan: un vulcan compozit - înalt, conic, compus din straturi multiple de lava solidificata, tefra si cenuşa vulcanica.
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