Cráitéar mór bolcánach a chruthaítear nuair a shocraíonn iarmhar an bholcáin síos isteach sa seomra magma a folmhaíodh sa bhrúchtadh. Uaireanta líonann an caildéara le huisce chun loch cráitéir a dhéanamh (mar shampla, Loch an Chráitéir i stát Oregon).[1]
Tagairtí
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