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Words List
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   Adret  
Subject: Geography
    The slope (usually equatorward, or southward in the Northern Hemisphere) of a mountain that faces into the sun. The term is originally and most often used in referring to mountains in the Alps. Tilted toward the sun, an adret is characterized by higher temperatures, a longer growing season, less snow cover and a shorter duration of snow cover, and a higher timber line and snow line than the shaded side (the ubac).


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   Adsorption  
Subject: Resources & Reserves
    Adhesion of gas molecules, or of ions or molecules in solution, to the surface of solid bodies with which they are in contact. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
 
  
   Adsorption Coefficient (Kd)  
Subject: Resources & Reserves
    [mineral processing] A measure of the degree to which constituents bind to a material (e.g., the soil).
 
 
  
   Advance  
Subject: Resources & Reserves
    1. A continuing seaward movement of a shoreline, as a result of progradation or emergence; also, net seaward movement during a specified time period. 2. The forward movement of a glacier front; also, the time interval marked by such a forward movement. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
   Advanced Very High Resolution Radiometer (AVHRR)  
Subject: Remote Sensing
    A five-channel scanning instrument that quantitatively measures electromagnetic radiation, flown on NOAA environmental satellites. AVHRR remotely determines cloud cover and surface temperature. Visible and infrared detectors observe vegetation, clouds, lakes, shorelines, snow, and ice. TIROS Automatic Picture Transmissions (APT) are derived from this instrument. Ref: Remote Sensing Glossary Reference Information for Virtual Nebraska
 
 
  
   advection  
Subject: The Earth
    The predominately horizontal large-scale movement of air that causes changes in temperature or other physical properties. In oceanography, advection is the horizontal or vertical flow of seawater as a current.
 
 
  
   advection fog  
Subject: The Earth
    Occurs when warm, moist air moves over a cold surface and the air cools to below its dew point.
 
 
  
   Aeolian   
Subject: Geography
    the erosion, transport, and deposition of material by wind, and work best when vegetation cover is sparse, or absent.


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   Aerate   
Subject: Resources & Reserves
    To supply or charge with air. Reference: R.L. Bates & J.A.Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
   Aeration  
Subject: Resources & Reserves
    The supplying of air to to the pores in a soil, or to waste water in a treatment plant. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
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