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Many factors, such as time, pressure, heat and plant material are involved in the formation of coal. As these factors vary, the coal produced may have different characteristics. Because coal is used as a fuel to produce heat, it is classified into four different types (ranks), based on the amount of heat it produces.
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kids.rrc.state.tx.us/school/classroom/coal/coalfrom.htm...
kids.rrc.state.tx.us/school/classroom/coal/coalfrom.html
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From the pressure of overlying sediments squeezing the water out of ancient plant remains.
http://wiki.answers.com/Q/Where_does_coal_come_from
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Two possibilities: 1. It is fossilised plant remains, deposited largely in the Carboniferous (hence the name) some 300 million years ago; which is why you can actually see the plant-like structure in all but the most fully metamorphosed g...
http://answers.yahoo.com/question/index?qid=20090821161...
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Coal is a natural resource found underneath the ground. ... the student will explain how producers use natural resources(water, soil, wood, and coal)human resources (people at work) ,and capital resources (machines, tools, and buildings) to produce goods and services for consumers .
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www.wjcc.k12.va.us/jr/3rdgradehershberger/alex.htm
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Now Kool and the Gang might not be to keen on all this - coal-fired electrical generation remains the dirtiest and most green house gas intensive form of energy.
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www.desmogblog.com/celebrate-our-coal-come-on
www.desmogblog.com/celebrate-our-coal-come-on
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Peak Coal Comes To Appalachia ... treehugger.com — This is an older article from 2007, but it is something of profound implications that the news media have ignored. Appalachian coal production has peaked; production rates are ...
http://tmpnetwork.com/environment/Peak_Coal_Comes_To_Ap...
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Built to demonstrate the feasibility of a new way to wring economical power from coal without belching assorted toxins into the air, the $600 million plant has been running steadily since 1996. "It makes the lowest-cost electricity on TECO's grid," Shorter says.
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discovermagazine.com/2006/dec/clean-coal-technology/art...
discovermagazine.com/2006/dec/clean-coal-technology/article_print
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When I mention clean-coal technology to Judy Bonds, a local activist and coal miner's daughter in Whitesville, West Virginia, she scoffs: "Even if you could get marshmallows to come out of a power plant's smokestacks, you can't wash the blood off coal."
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discovermagazine.com/2006/dec/clean-coal-technology/art...
discovermagazine.com/2006/dec/clean-coal-technology/article_view?b_start:int=1&-C=
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