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  Results 41 to 50 of 2905
Words List
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   acid fog  
Subject: The Earth
    See acid rain.
 
 
  
   Acid Mine Drainage  
Subject: Resources & Reserves
    Drainage with a pH of 2.0 to 4.5 from mines and mine wastes. It results from the oxidation of sulfides exposed during mining, which produces sulfuric acid and sulfate salts. The acid dissolves minerals in the rocks, further degrading the quality of the drainage water. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   acid rain  
Subject: The Earth
    Cloud droplets or raindrops combining with gaseous pollutants, such as oxides of sulfur and nitrogen, to make falling rain (or snow) acidic - pH less than 5.6. If fog droplets combine with such pollutants it becomes acid fog. It is caused by emissions of sulphur dioxide and nitrogen oxides. Although natural sources of sulphur oxides and nitrogen oxides do exist, more than 90% of the sulphur and 95% of the nitrogen emissions occurring in eastern North America are of human origin. These primary air pollutants arise from the use of coal in the production of electricity, from base-metal smelting, and from fuel combustion in vehicles. Once released into the atmosphere, they can be converted chemically into such secondary pollutants as nitric acid and sulfuric acid, both of which dissolve easily
 
 
  
   Acid-base indicator  
Subject:  Laboratories
    Acid-base indicator is a weak acid or weak base, such as litmus or phenolphthalein, which changes colour when it gains or loses an H+ion.


more information
 
 
  
   Acoustic Log  
Subject: Resources & Reserves
    Generic term for a well log that displays any of several measurement of acoustic waves in rocks exposed in a borehole, e.g. compressional-wave transit time over an interval (sonic log). Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   acoustic thermography  
Subject: The Earth
    The use of sound waves to measure seawater temperature.
 
 
  
   Acoustic Wave  
Subject: Resources & Reserves
    A longitudinal wave. In common usage it is restricted to fluids such as air, but it often includes P-waves in the solid earth. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
   Acoustical Well Logging   
Subject: Resources & Reserves
    Any determination of the physical properties of a borehole by acoustical means. Travel times of P-waves over a unit distance are usually measured to determine velocities of surrounding rocks. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
   Active continental margin  
Subject: Geology
    Usually narrow and consisting of highly deformed sediments. Such margins occur where oceanic lithosphere is being subducted beneath the margin of a continent. Reference : Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Active layer  
Subject: Geology
    The zone above the permafrost that thaws in summer and refreezes in winter. Reference : Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
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