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Mining

Of or pertaining to the process or business of extracting materials, such as ore or minerals, from the earth's crust.

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cobblestone

Sports; Bicycle & electric bicycle

a naturally rounded stone larger than a pebble and smaller than a boulder; such a stone used in paving a street or in construction.

backfill

Energy; Coal

Material that is used, after mining has been completed in an area, to support the back or roof of the mine from collapse.

seigniorage

Financial services; General Finance

The profit which results from the difference between the cost of making coins and currency and the exchange value of coin and currency in the market.

spot trade

Financial services; General Finance

The purchase and sale of a foreign currency, commodity, or other item for immediate delivery.

azimuthal quantum number (k)

Astronomy; General astronomy

A measure of the minor axis of an elliptic orbital of an electron according to the Bohr-Sommerfeld theory.

cog

Sports; Bicycle & electric bicycle

a sprocket on the rear wheel's cassette or freewheel.

Pastry Blender

Kitchen & dining; Cooking tools

This hand-held tool consists of several u-shaped wires or metal blades attached to a handle. It is used to cut butter or shortening into flour, which is an essential step in ...

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