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Scoria or cinder is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. [ 1 ] [ 2 ] It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition.
A cinder cone (or scoria cone [1]) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent. [ 2 ] [ 3 ] The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent.
Scoria is part of WikiProject Rocks and minerals, an attempt at creating a standardized, informative, comprehensive and easy-to-use rocks and minerals resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information.
Scoria bricks [a] is a type of blue-grey brick made from slag, originally manufactured from the waste of the steelworks of Teesside, common across the North-East of England. [ 3 ] [ 4 ] The bricks were also exported around the world and can be found in Canada, West Indies , Netherlands, Belgium, United States, India and South America.
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The cone is constructed on a formation of lava and scoria over 175 metres (574 ft) thick, which may lie on Jurassic rocks. [2] [3] Glaciers or wind have eroded debris from the cone, forming a "tail" several kilometres long on the ice. [4] Potassium-argon dating has indicated ages of 1.4-0.9 mya, [1] and the volcano formed in the absence of ice. [4]
Today's Wordle Answer for #1314 on Thursday, January 23, 2025. Today's Wordle answer on Thursday, January 23, 2025, is UPPER. How'd you do? Up Next:
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