Fenomeni naturali, la potenza distruttiva di un vulcano. Guarda i video
Cos’è realmente quello che noi chiamiamo vulcano? E come avviene un’eruzione? La scheda di Ecoseven.net sui vulcani e la loro potenza distruttiva. Guarda il video
L’eruzione, la lava e le ceneri di un vulcano hanno il potere di distruggere un’intera città e i suoi abitanti. Tantissimi anni fa l’eruzione del Vesuvio rase al suolo le ridenti cittadine di Pompei ed Ercolano. Senza preavviso, senza nulla poter fare. Per anni Pompei è rimasta coperta di ceneri, conservando sotto la potenza distruttiva del Vesuvio le bellezze e l’arte della città romana.
Un film ha riproposto la paura e la tragicità di quei giorni, tra storia e finzione, raccontando ‘Gli ultimi giorni di Pompei’:
A distanza di millenni, ancora oggi, l’eruzione dei vulcani fa paura e incute timore. Lo scorso 8 febbraio ha eruttato l’Etna, tra preoccupazioni, disagi (limitati ovviamente) e immagini spettacolari.
Ma cos’è un vulcano? Cos’è l’eruzione vulcanica? Come avviene? Un vulcano, in termini scientifici, è una spaccatura della crosta terrestre, da cui fuoriescono materiali gassosi, liquidi e solidi ad alta temperatura. Per eruzione vulcanica intendiamo, quindi, la fuoriuscita, sulla superficie terrestre di magma ed altri materiali gassosi provenienti dal mantello o dalla crosta.
Per capire come avviene un’eruzione bisogna prima spiegare che un vulcano ha una camera magmatica, o bacino magmatico, che è un deposito temporaneo in cui si raccoglie il magma prima di uscire. Se il magma è abbastanza leggero, perché caldo e ricco di gas, questo allora fuoriesce con un andamento tranquillo, costante e regolare nel tempo. Un’eruzione improvvisa, e più distruttiva, è invece quella che si scatena quando i gas che risiedono nella massa magmatica riescono a superare la pressione esterna esercitata dalla colonna magmatica sovrastante o da un tappo solido che ostruisce il condotto.
Un video dell’eruzione del famoso vulcano islandese:
(GC)
Altri articoli consigliati per te:
come avviene l'eruzione di un vulcano, eruzione, eruzione Vulcani, Pompei, vulcani, vulcani in attività, vulcani italiani
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