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Rotring (stylized rOtring) is a manufacturer of technical drawing tools and writing implements. Established in Germany in 1928 as a fountain pen manufacturer, Rotring went on to be acquired by Newell Brands in 1998. [3] [1] The name "Rotring" directly translates to "red ring", which refers to the company's signature: a red band placed around ...
Due to this unusual composition, the lava is erupted at relatively low temperatures (approximately 500–600 °C). [4] This temperature is so low that the molten lava appears black in sunlight, rather than having the red glow common to most lavas. It is also much more fluid than silicate lavas.
The Cadillac Gage LAV-600, also known as the V-600, [2] is an American light armored 6×6 wheeled vehicle, derived from the LAV-300. Developed by Cadillac Gage as a private venture project, [ 1 ] the LAV-600 offers superior firepower and mobility to the LAV-300, normally being equipped with a 105mm main gun.
The emission of a lava flow onto the western flank of Ol Doinyo Lengai in 2006 was accompanied by the formation of a pit crater on the summit. [ 53 ] A large explosive eruption began on the 4 September 2007, producing a 3-kilometre (1.9 mi)-high eruption column [ 54 ] and a new crater 100 metres (330 ft) deep and 300 metres (980 ft) wide. [ 55 ]
The tendency of felsic lava to be cooler than mafic lava increases the viscosity difference. The silicon ion is small and highly charged, and so it has a strong tendency to coordinate with four oxygen ions, which form a tetrahedral arrangement around the much smaller silicon ion. This is called a silica tetrahedron. In a magma that is low in ...
It is likely that the lava spreads by a process of inflation in which the lava moves beneath a solid insulating crust, which keeps it hot and mobile. [36] Studies of the Ginkgo flow of the Columbia River Plateau, which is 30 to 70 meters (98 to 230 ft) thick, show that the temperature of the lava dropped by just 20 °C (68 °F) over a distance ...
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