Monday, May 03, 2004

Caldera

(Spanish: �caldron�), large bowlshaped volcanic depression more than one kilometre in diameter and rimmed by infacing scarps. Calderas usually, if not always, form by the collapse of the top of a volcanic cone or group of cones because of removal of the support formerly furnished by an underlying body of magma (molten rock). Often this collapse is of a composite cone that

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