Coal (from the Old English term col, which has meant "mineral of fossilized carbon" since the 13th century) is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
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Some articles on coal:
... Imports of Coal by Country and year (million short tons) Country 2010 ... Share Japan 199.7 209.0 206.0 182.1 206.7 17.5% China 42.0 56.2 44.5 151.9 195.1 16.6% South Korea 84.1 94.1 107.1 109.9 ...
... River basin and the Benue trough and has the best developed coal in this area ... Precambrian basement rock in this region is overlaid with sediments bearing coal from the Cretaceous and Tertiary age ... Coal seams in the Enugu coal district measure between 1 and 2 metres (3.3 and 6.6 ft) in thickness and the reserves have been estimated to be more than 300 million tonnes ...
... Coal seams are also exposed in some badlands, so historically, coal mining districts have developed in badlands areas ...
... See also Economy of Nigeria Nicknamed the Coal City, Enugu's economy in the early 20th century depended on coal mining in the Udi plateau this industry was the pushing ... The Nigerian Coal Corporation has been based in Enugu since its creation in 1950 where it controlled coal mining ... widespread devastation that forced a decline in coal production from damage or destruction of equipment ...
... White coal is a form of fuel produced by drying chopped wood over a fire ... White coal was used in England to smelt lead ore from the mid-sixteenth to the late seventeenth centuries ... White coal could be use mixed with charcoal for other industrial uses than lead smelting ...
More definitions of "coal":
- (noun): A hot glowing or smouldering fragment of wood or coal left from a fire.
- (verb): Take in coal.
Example: "The big ship coaled"
- (noun): Fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period.
- (verb): Burn to charcoal.
Famous quotes containing the word coal:
“Writing is to descend like a miner to the depths of the mine with a lamp on your forehead, a light whose dubious brightness falsifies everything, whose wick is in permanent danger of explosion, whose blinking illumination in the coal dust exhausts and corrodes your eyes.”
—Blaise Cendrars (18871961)
“Mr. Christian, it is about time for many people to begin to come to the White House to discuss different phases of the coal strike. When anybody comes, if his special problem concerns the state, refer him to the governor of Pennsylvania. If his problem has a national phase, refer him to the United States Coal Commission. In no event bring him to me.”
—Calvin Coolidge (18721933)
“The rooms very hot, with all this crowd, the Professor said to Sylvie. I wonder why they dont put some lumps of ice in the grate? You fill it with lumps of coal in the winter, you know, and you sit round it and enjoy the warmth. How jolly it would be to fill it now with lumps of ice, and sit round it and enjoy the coolth!”
—Lewis Carroll [Charles Lutwidge Dodgson] (18321898)