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Words List
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   Aftershock  
Subject: Resources & Reserves
    An earthquake that follows a larger earthquake and originates at or near the focus of the letter. many aftershocks may follow a major earthquake; they decrease in frequency and magnitude with time. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   Aftershock  
Subject: Geology
    A smaller earthquake that follows the main earthquake. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
  
   Agate  
Subject: Resources & Reserves
    A translucent cryptocrystalline variety of quartz, being a variegated chalcedony frequently mixed or alternating with opal, and characterized by colors arranged in alternating stripes or bands, in irregular clouds, or in mosslike forms. Agate is found in vugs in volcanic rocks and in cavities in some other rocks. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   Age   
Subject: Resources & Reserves
    1. A unit of geologic time shorter than an epoch and longer than a subage, during which the rocks of a stage were found. 2. An informal term for a length of geologic time during which the rocks of any stratigraphic unit were formed. 3. A division of earth history of unspecified duration, marked by a dominant or important life form, as the "age of fishes". 4. The time during which a particular event occured, or one that was marked by special physical conditions, e.g. the "Ice Age". 5. The position of anything in the geologic time scale, e.g. "rocks of Miocene age". Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
   Agglomerate  
Subject: Resources & Reserves
    A volcanic breccia formed by disruption of a solidified crust or hardened plug of lava. Blocks may fit together as a loose mosaic or be completely disordered. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   agglomeration  
Subject: The Earth
    (Meteorology) The process by which precipitation particles grow larger by collision or contact with cloud particles or other precipitation particles.
 
 
  
   Aggradation  
Subject: Resources & Reserves
    1. The process of building up a surface by deposition. 2. The spread or growth of permafrost. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   Aggregate  
Subject: Resources & Reserves
    A rock material such as sand, gravel, or crushed rock with which cement or bitumen is mixed to form a mortar or concrete.
 
 
  
   Aging  
Subject: Resources & Reserves
    The process by which a young lake becomes an old lake as a result of filling and nutrient loading, eutrophication, vegetation encroachment, and other actions. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
   Agonic line  
Subject: Geography
    The line through all points on the earth's surface at which the magnetic declination is zero; that is, the locus of all points at which magnetic north and true north coincide. This line is a particular case of an isogonic line. ...


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