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 ...
A gyratory crusher is similar in basic concept to a jaw crusher, consisting of a concave surface and a conical head; both surfaces are typically lined with manganese ...
|||Geological formation . Large gravel deposits are a common geological feature, being formed as a result of the weathering and erosion of rocks. The action of rivers ...
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