Category Archives: 2009.04April

4. Coal Quality

The amount of impurities (ash and trace elements) in the coal determines its GRADE: 1. Ash. Ash is the unburnable part of coal. It is most often sand and clay blown into the swamp or brought in by river or … Continue reading

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5. Acid Rain’s Effect

The term acid rain does not convey the true nature of the problem. Scientists therefore use “acid dispositions”. Acid which has formed due to pollution may return to the earth as a solid or a gas and not just as … Continue reading

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