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Topic: Caldera

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	USGS Photo Glossary: caldera
		The caldera is 10 km in diameter and 500-1,000 m deep.
		A caldera is a large, usually circular depression at the summit of a volcano formed when magma is withdrawn or erupted from a shallow underground magma reservoir.
		Calderas are different from craters, which are smaller, circular depressions created primarily by explosive excavation of rock during eruptions.
	volcanoes.usgs.gov /Products/Pglossary/caldera.html (340 words)

	Resurgent Calderas and the Valles Caldera
		Caldera in the Spanish language means "kettle" or "cauldron"; in geological literature, it has come to be known as a volcanic collapse crater.
		Calderas, on the other hand, are formed when infrequent, truly large eruptions occur and the gas-rich magma is quickly erupted from depths of 4 to 6 kilometers (2.5 to 3.7 miles).
		The caldera rim consists of deeply eroded hills and cliffs.
	www.solarviews.com /eng/valles.htm (1331 words)

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