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fotografii: Gabriel Pătruţ
Părţile componente ale unui vulcan

I. Vatra (focarul magmatic) – cavitate în care este închisă magma de temperaturi uriaşe situată sub vulcan;
II. Coşul – canalul prin care urcă la suprafaţă lava şi gazele vulcanice;
III. Craterul – orificiul lărgit în formă de pâlnie, situat în prelungirea coşului, pe unde lava ajunge la suprafaţă;
IV. Conul – muntele rezultat prin acumularea materialelor provenite din erupţie;
V. Norul vulcanic – cenuşă şi alte reziduuri vulcanice (pietre, praf) aruncate de erupţie
Ştiai că… numele «Vulcan» vine de la zeul roman al focului?
• Pe pământ există circa 1.300 de vulcani activi. Se numesc activi vulcanii care erup cu regularitate sau au erupt cel puţin o dată în ultimii 10.000 de ani.
• Dacă un vulcan nu a erupt în ultimii 10.000 de ani, îl numim vulcan adormit. Dacă nu a erupt de peste 25.000 de ani se poate considera stins.
• Cei mai mulţi vulcani nu se pot vedea, ei fiind submarini, dar circa 500 sunt vizibili deasupra apei.
• Cel mai mare crater vulcanic se află în Indonezia, insula Sumatra la Toba. Are o suprafaţă de 1.775 kilometri pătraţi.
• Vulcanii au fost denumiţi după zeul roman al focului, Vulcanus.
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