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mantle
(Encyclopedia) mantle, portion of the earth's interior lying beneath the crust and above the core. No direct observation of the mantle, or its upper boundary, has been made; its boundaries have been…feldspar
(Encyclopedia) feldsparfeldsparfĕlˈspär, fĕldˈ– [key] or felsparfeldsparfĕlˈspär [key], an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars…Brewer's: Dictionary of Phrase and Fable: I
E. Cobham Brewer, 1894 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z I I.H.S I.O.U I.R.B Iachimo Iago Ianthe Iapetos Iberia Iberia's Pilot…coke
(Encyclopedia) coke, substance obtained by the destructive distillation of bituminous coal. Coke bears the same relation to coal as does charcoal to wood. A hard, gray, massive, porous fuel, coke is…spring, in geology
(Encyclopedia) spring, in geology, natural flow of water from the ground or from rocks, representing an outlet for the water that has accumulated in permeable rock strata underground. Some of the…mountain
(Encyclopedia) mountain, high land mass projecting conspicuously above its surroundings and usually of limited width at its summit. Although isolated mountains are not unusual, mountains commonly…lava
(Encyclopedia) lavalavaläˈvə [key], molten rock that erupts on the earth's surface, either on land or under the ocean, by a volcano or through a fissure. It solidifies into igneous rock that is also…Million-Dollar Math Problem
—By Borgna Brunner After a seven-year, three-billion-mile expedition through the solar system, NASA’s Stardust spacecraft capsule landed in the Arizona desert on Jan. 15, 2006, with an…sand
(Encyclopedia) sand, rock material occurring in the form of loose, rounded or angular grains, varying in size from .06 mm to 2 mm in diameter, the particles being smaller than those of gravel and…basalt
(Encyclopedia) basaltbasaltbəsôltˈ, băsˈôlt [key], fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has…Trending
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