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Glossary of Geology Terms
beginning with letter F
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facet
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noun
  1. Any one of the flat surfaces cut into a gem.
The facets of the diamond were masterfully cut to enhance its value.
  1. One among many similar or related, yet still distinct things.
The child's learning disability was only one of the problems contributing to his delinquency.
  1. One of a series of things, such as steps in a project.
We had just about completed the research of the project when the order came to cancel it.
  1. (anatomy) One member of a compound eye, as found in insects and crustaceans.
verb
  1. To cut a facet into a gemstone.
facies
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noun
  1. (plurale tantum) (medicine) facial features, like an expression or complexion, typical for patients having certain diseases or conditions (e.g. costive facies).
fault
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noun
  1. A defect; something that detracts from perfection
  2. A mistake or error
  3. A weakness of character
  4. A minor offense
  5. Blame; the responsibility for a mistake
  6. (Geology) A fracture in a rock formation causing a discontinuity
  7. (Tennis) An illegal serve
  8. (electrical) An abnormal connection in a circuit.
verb
  1. (transitive) To criticize, blame or find fault with something or someone.
  2. (context, intransitive, geology) To fracture.
  3. (intransitive) To commit a mistake or error.
focus
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noun (foc, i , - , pl2=focuses)
  1. (countable) (optics) a point at which reflected or refracted rays of light converge.
The heat of sunlight at the of a magnifying glass can easily set dry leaves on fire.
  1. (countable) (geometry) a point of a conic at which rays reflected from a curve or surface converge.
  2. (uncountable) (photography, cinematography) The fact of the convergence of light on the photographic medium.
Unfortunately, the license plate is out of in this image.
  1. (uncountable) (photography, cinematography) The quality of the convergence of light on the photographic medium.
During this scene, the boy"s face shifts subtly from soft into sharp .
  1. (uncountable) concentration of attention.
I believe I can bring the high degree of required for this important job.
  1. (countable) the exact point of where an earthquake occurs, in three dimensions.
The earthquake's was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.
verb (focuses or, less commonly, focusses, focusing or, less commonly, focussing, focused or, less commonly, focussed)
  1. (transitive) To cause (rays of light, etc) to converge at a single point.
  2. (transitive) To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
You'll need to the microscope carefully in order to capture the full detail of this surface.
  1. (transitive) (followed by on or upon) To concentrate one's attention.
Focus on passing the test.
  1. (transitive) To make (a liquid) less diluted.
  2. (intransitive) To concentrate one"s attention.
If you're going to beat your competitors, you need to .
fold
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noun
  1. the act of folding
  2. a bend or crease.
  3. any correct move in origami.
verb (folds, folding, folded, folded or rarely folden)
  1. (transitive) to bend (any thin material, such as paper) over so that it comes in contact with itself.
  2. (transitive) to make the proper arrangement (in a thin material) by bending.
If you the sheets, they'll fit more easily in the drawer.
  1. (Informal) to fall over.
  2. (intransitive) to give way on a point or in an argument.
  3. (intransitive) (poker) To withdraw from betting.
  4. (transitive) To stir gently, with a folding action.
Fold the egg whites into the batter.
  1. (intransitive) Of a company, to cease to trade.
fossilize
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verb to fossilize (intransitive)
  1. to become a fossil
  2. (context, by extension) to become inflexible or outmoded
friable
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adjective
  1. Easily broken into small fragments, crumbled, or reduced to powder.
    • 1977: Spiders had woven their vague trapezes between the heads of dead peonies in enormous glass jars streaked with tide marks where the water had evaporated long ago. " Angela Carter, The Passion of New Eve
      1. (context, of soil) loose, Loose and large-grained in consistency.
fumarole
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noun
  1. An opening in the crust of an astronomical body that emits steam and gases.
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