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   Valence electron  
Subject: Geology
    The electrons involved in the bonding process; the electrons occupying the highest principal energy level of an atom. Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Valley  
Subject: Geography
    A linear depression in the landscape that slopes down to a stream, lake or the ocean. Formed by water and/or ice erosion.


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   valley breeze  
Subject: The Earth
    See mountain breeze.
 
 
  
   valley fog  
Subject: The Earth
    See radiation fog.
 
 
  
   Valley glacier  
Subject: Geology
    A glacier that flows from a cirque or cirques onto and along the floor of a valley. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
 
  
   Valley train  
Subject: Geology
    A relatively narrow body of stratified drift deposited on a valley floor by meltwater streams that issue from the terminus of an alpine glacier. Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Van der Waals bond  
Subject: Geology
    A weak electrostatic attraction that arises because certain ions and atoms are distorted from a spherical shape. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
 
  
   vapor  
Subject: The Earth
    The gaseous phase of substances that are liquid or solid at atmospheric pressure (e.g., steam).
 
 
  
   vapor pressure  
Subject: The Earth
    The pressure exerted by the water vapor molecules in a given volume of air.
 
 
  
   varve  
Subject: The Earth
    A layer of sediment deposited in lakes during one year. Each layer consists of two parts, which are deposited at different seasons and which differ in color and texture; thus, the layers can be counted and measured. In a complete series, the number of layers gives the date on which the ground was vacated by the retreating ice.
 
 
  
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