the gases prior to the release from a power plant's smokestack.Formation�C Any assemblage of rocks which have some character in common, whether of origin, age, or composition. Often, the word is loosely used to indicate anything that has been formed or brought into its present shape.
Fossil fuel�C Any naturally occurring fuel of an organic nature, such as coal, crude oil and natural gas.
Fracture- A general term to include any kind of discontinuity in a body of rock if produced by mechanical failure, whether by shear stress or tensile stress. Fractures include faults, shears, joints, and planes of fracture cleavage.
Friable- Easy to break, or crumbling naturally. Descriptive of certain rocks and minerals.
Fuse- A cord-like substance used in the ignition of explosives. Black powder is entrained in the cord and, when lit, burns along the cord at a set rate. A fuse can be safely used to ignite a cap, which is the primer for an explosive.
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