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   Ultimate base level  
Subject: Geology
    Sea level; the lowest level to which stream erosion could lower the land. Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Ultramafic composition  
Subject: Geology
    A compositionČal group of igneous rocks containing mostly olivine and pyroxene. Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Ultraviolet light  
Subject:  Laboratories
    Ultraviolet light (UV light) is an electromagnetic radiation with a wavelength longer than that of x-rays, but shorter than that of visible light. Ultraviolet light can break some chemical bonds and cause cell damage.


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   ultraviolet radiation  
Subject: The Earth
    Electromagnetic radiation with wavelengths longer than X-rays but shorter than visible light.
 
 
  
   Umptekite  
Subject: rock
    Umptekite is a sodium-amphibole syenite, discovered in 1894 by Ramsay in Umpyavr in the Umptek (=Khibiny) massif.
 
 
  
   Unconformity  
Subject: Geology
    A substantial break or gap in a stratigraphic sequence that marks the absence of part of the rock record. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
 
  
   Uniformitarianism  
Subject: Geology
    The concept that the processes that have shaped Earth in the geologic past are essentially the same as those operating today. Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   unstable air  
Subject: The Earth
    See Absolutely unstable air.
 
 
  
   updraft   
Subject: The Earth
    A small-scale current of rising air. If the air is sufficiently moist, then the moisture condenses to become a cumulus cloud or an individual tower of a towering cumulus or Cb.
 
 
  
   upslope flow   
Subject: The Earth
    Air that flows toward higher terrain, and hence is forced to rise. The added lift often results in widespread low cloudiness and stratiform precipitation if the air is stable, or an increased chance of thunderstorm development if the air is unstable.
 
 
  
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