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see cratercrater,
circular, bowl-shaped depression on the earth's surface. (For a discussion of lunar craters, see moon.) Simple craters are bowl-shaped with a raised outer rim. Complex craters have a raised central peak surrounded by a trough and a fractured rim.
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A large collapse depression at a volcano summit that is typically circular to slightly elongate in shape, with dimensions many times greater than any included vent. It ranges from a few miles to 37 miles (60 kilometers) in diameter. It may resemble a volcanic crater in form, but differs in that it is a collapse rather than a constructional feature.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


(The SCO Group, Inc., Lindon, UT, A vendor of Unix operating systems for the x86 platform. After SCO declared bankruptcy in 2007, UnXis was formed in 2011 to acquire all its assets and intellectual property.

The SCO Group was the combination of two companies: Utah-based Caldera, Inc. and Santa Cruz-based The Santa Cruz Operation.

Caldera was a software company founded in 1994 by Ransom Love and Bryan Sparks. Its primary products were the OpenLinux and DR-DOS operating systems (see DR-DOS). In 2001, Caldera acquired the products and people from The Santa Cruz Operation, widely known as SCO, and a year later changed the company name to The SCO Group.

The Santa Cruz Operation was founded in 1979 as a custom programming house. In 1984, it introduced SCO XENIX, its first operating system, which ran on the Apple Lisa, PC XT and the DEC Pro 350. It later developed only for the Intel platform, and more than two million licenses of its Unix client and server products were sold. In 1995, SCO purchased UnixWare and all the AT&T source code for Unix System V from Novell. It merged UnixWare and its OpenServer product into a single operating system, which was released in 1998 as SCO UnixWare 7. SCO had also offered Linux, but abandoned the line in the spring of 2003. See UnixWare and OpenServer.
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References in periodicals archive ?
The above-mentioned examples express the following morphologic characteristics of volcanic calderas: 1) Caldera bottom is flat; 2) Only one outlet drainage is present; 3) Caldera wall is steep with declivity of about 3[degrees]; 4) The areas out of the caldera wall are covered by extensive pyroclastic deposits or lava flows with extension of more than 20 km; 5) The surface of these eruptive deposits has gentle outward declivity of about 3[degrees].
In 2003 a preliminary Geothermal Research study was completed by INGEOMINAS with the definition of a high-temperature geothermal system, the identification of a volcanic caldera and the definition of two eruptive epochs (in the sense of Fisher & Schmincke, 1984).
These characteristics caused some researchers to propose that Cruger and the other smooth-walled craters might be collapsed volcanic calderas. This was a viable hypothesis until it became apparent that virtually all lunar craters resulted from impacts.
Future Cassini observations may help scientists determine whether the feature really is a lake, or whether it's a dry lakebed, volcanic caldera, or something else.
The proposal that the central peak of Alphonsus was an active volcanic cone, and that the enclosing crater was a volcanic caldera, was not as outlandish then as it might seem now.
Pete Schultz, while still a graduate student at the University of Texas, suggested that Hyginus may in fact be a volcanic caldera or collapse crater.
An abandoned village and stunning lakes in the volcanic calderas all add to the charm.
According to the study, there should be more research in the future to better understand the subtle activity of volcanic calderas and the movements of magma beneath them.
Here, in the volcanic calderas, are to be found geothermal wells providing low carbon energy and boosting a resource-efficient green economy.
Moreover, depressions resembling volcanic calderas lie at the edges of the swaths.
Some round features captured by the orbiter's radar frustrate scientists, who cannot tell whether they indicate volcanic calderas or craters caused by meteorite impacts.