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While coal has been reported in rocks as old as Proterozoic (possibly 2 billion years) and as young as Pliocene (2 million years old), the great majority of the world's coal was laid down during the Carboniferous Period, a 60-million-year stretch (359-299 m.y.a.) when sea level was high and forests of tall ferns and...
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geology.about.com/od/mineral_resources/a/aa_nutshellcoa...
geology.about.com/od/mineral_resources/a/aa_nutshellcoal.htm
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The coal that we find in soil near our home probably was mined here in Illinois or nearby ; Midwestern states. It was brought to our neighborhood about 50 to 100 years ago, when most people had ... Other rocks that look like coal ... Here are some ways to classify coal (by grouping it with similar types of rocks):
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www.saltthesandbox.org/rocks/coal.htm
www.saltthesandbox.org/rocks/coal.htm
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This period is recognized in the USA as the Mississippian and Pennsylvanian time periods due to the significant sequences of these rocks found in those states. Coal is mined in these states and in many others that have rocks of this age found in them.
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www.galleries.com/rocks/coal.htm
www.galleries.com/rocks/coal.htm
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Students review the differences between rocks and minerals and categorize the ranks of coal. They also complete a map activity identifying countries and states where large deposits of coal are found. ; Objectives:; ... examine samples of coal and hypothesize whether the samples are rocks or minerals,
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www.teachcoal.org/lessonplans/rocks_minerals.html
www.teachcoal.org/lessonplans/rocks_minerals.html
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Coal is found in Pennsylvanian rocks in eastern and western Kentucky, where it is interbedded with shales, sandstones, conglomerates, and thin limestones. The Pennsylvanian Period began approximately 320 million years ago and lasted about 30 million years;
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www.uky.edu/KGS/rocksmn/coal.htm
www.uky.edu/KGS/rocksmn/coal.htm
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The numerous layers of coal beds in both of Kentucky's coal fields are intermixed with shale and sandstone (and rarely with thin limestones). Most of the major coal beds (there are about 45 to 50 in eastern Kentucky) ... A variety of plant and animal fossils are found in the coal-bearing rocks in and around Kentucky.
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www.uky.edu/KGS/coal/coalbear.htm
www.uky.edu/KGS/coal/coalbear.htm
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Over the past week, as Environmental Capital readers will recall, four big Wall Street banks have announced a new reticence to finance conventional coal-fired power plants.
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blogs.wsj.com/environmentalcapital/2008/02/14/utilities...
blogs.wsj.com/environmentalcapital/2008/02/14/utilities-to-wall-street-coal-still-rocks/
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Coal found close to the surface can be uncovered and removed by large machines in a process that is called surface mining. Surface mining techniques account for 60 percent of coal produced in the United States -- 75 percent in Western states, where some deposits are up to 100 feet thick.
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www.ket.org/Trips/Coal/AGSMM/agsmmproduced.html
www.ket.org/Trips/Coal/AGSMM/agsmmproduced.html
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Igneous Rocks ... Igneous rocks solidify from a liquid magma as it cools. They are described on two axies: 1) Rocks that are quartz rich (felsic) to magnesium rich (mafic) and 2) fast cooling (small crystals) to slow cooling (large crystals). ... Sedimentary Rocks Coal Formation...
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www.athro.com/earth_science/rocks.html
www.athro.com/earth_science/rocks.html
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