Glossary of Mining Terms - Coal Education A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...
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Water Words Glossary - NALMS (1) The entrance of water into the soil or rocks by all natural processes, including the infiltration of precipitation or snowmelt, gravity flow of streams into the ...
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Erosion - Wikipedia, the free encyclopedia Valley or stream erosion occurs with continued water flow along a linear feature. The erosion is both downward, deepening the valley, and headward, extending the ...
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Glossary of geologic terms | Department of... Glossary of Geologic Terms. This glossary of geologic terms is based on the glossary in Earth: An Introduction to Geologic Change, by S. Judson and S.M. Richardson
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 Stone Quarries & Beyond- Los Angeles County Los Angeles County, 1916 Map, from California Mineral Production for 1919 (with County Maps), Bulletin No. 88, by Walter W. Bradley, California State Mining Bureau ...
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