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| Results: |
fatigue
The weakening or failure of a material after many repetitions of a stress that of itself is not strong enough to cause failure.
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fault
A fracture in crustal rocks along which there has been displacement of the two sides relative to one another parallel to the fracture.
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fauna
The entire animal population, living or fossil, of a given area, environment, formation, or time span.
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ferrous mineral
Any mineral having a considerable portion of iron in its composition.
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firedamp
A combustible gas that is formed in mines by decomposition of coal or other carbonaceous matter and that consists chiefly of methane, also the explosive mixture formed by this gas with air.
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fleet angle
The included angle between the rope, in its position of travel across the drum, and a line drawn perpendicular to the drum shaft, passing through the center of the head sheave.
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flywheel
A heavy wheel used in a rotating system to reduce surges of power input or demand by storing and releasing kinetic energy as it changes its rate of rotation.
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fold
A curve of a structure such as rock strata, bedding planes or cleavage. A fold is usually a product of deformation.
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