Caldera:
A large, bowl-shaped crater associated with a volcanic vent. A caldera can form from a volcanic blast or the collapse of a volcanic cone into an emptied magma chamber.
Carbonate Rock: ...
caldera -- n. A large circular volcanic depression, often originating due to collapse.
carbon film -- Thin layer of carbon remains of past life found in sedimentary rocks.
caldera A large, basin-shaped volcanic depression, more or less circular in form. Typically steep-sided, found at the summit of a shield volcano .
Caldera A large circular depression in a volcano. Caldera Volcano Explosive type of volcano that leaves a large circular depression. Some of these depressions can be as large as 40 kilometers in diameter.
he studied the origins of Batur caldera on Indonesia's resort island of Bali as well as other volcanoes in remote eastern Indonesia.
In 2000, SCO sold its entire UNIX business and assets to Caldera Systems, which later on changed its name to The SCO Group. This new player then started legal action against various users and vendors of Linux.
 See also: Surface, Volcanic, Feature, Region, Area
  
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