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   Accessory Mineral  
Subject: Resources & Reserves
    A mineral whose presence in a rock is not essential to the proper classification of the rock. Accessory minerals generally occur in minor amounts; in sedimentary rocks, they are mostly heavy minerals. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   Accretion   
Subject: Resources & Reserves
    1. The gradual addition of new land to old by the deposition of sediment carried by the water of a stream. 2. the process by which inorganic bodies grow larger, by the addition of fresh material to the out side. 3. A theory of continental growth by the addition of successive to the craton. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   Accretionary wedge  
Subject: Geology
    A large wedge-shaped mass of sediment that accumulates in subduction zones. Here sediment is scraped from the subducting oceanic plate and accreted to the overriding crustal block. Reference : Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Accumulation  
Subject: Geology
    Volume of displaced materia that lies above original ground surface. Reference : Conrnforth, D.H, LANDSLIDE IN PRACTICE, Jon Wiley & sons, 2005
 
 
  
   accumulation (glacial)  
Subject: The Earth
    accumulation (glacial) All processes, which include snowfall, condensation, avalanching, snow transport by wind, and freezing of liquid water, that add snow or ice to a glacier, floating ice, or snow cover. The term also includes the amount of snow or other solid precipitation added to a glacier or snowfield by these processes. .
 
 
  
   Accuracy   
Subject: The Earth
    Accuracy -is the degree to which information on a map or in a digital database matches true or accepted values. Accuracy is an issue pertaining to the quality of data and the number of errors contained in a dataset or map. In discussing a GIS database, it is possible to consider horizontal and vertical accuracy with respect to geographic position, as well as attribute, conceptual, and logical accuracy. The effect of inaccuracy and error on a GIS solution is the subject of sensitivity analysis . Accuracy, or error, is distinguished from precision , which concerns the level of measurement or detail of data in a database
 
 
  
   Achondrites  
Subject: rock
    Achondrites formed from chondritic meteorites that have reached a sufficient mass to heat up internally, thereby causing separation of the lighter and heavier components. Achondrites represent the lighter component forming mantle and crustal rocks.
 
 
  
   Acicular   
Subject: Resources & Reserves
    Needle-shaped, like certain crystals. Also, said of sedimentary particles more than three times as long as wide. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   Acid  
Subject: Resources & Reserves
    1. acidic. 2. Said of a plagioclase that is sodic. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   acid deposition  
Subject: The Earth
    acid deposition: The depositing of acidic particles (usually sulfuric acid and nitric acid) at the earth's surface. Acid deposition occurs in dry form (dry deposition) or wet form (wet deposition). Acid rain and acid precipitation often denote wet deposition. (See Acid rain.)
 
 
  
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