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Words List   (P)
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   P wave   
Subject: Geology
    The fastest earthquake wave, which travels by compression and expansion of the medium. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   P/E ratio (precipitation-evaporation ratio)  
Subject: The Earth
    An expression devised for the purpose of classifying climates; based on monthly totals of precipitation and evaporation.
 
 
  
   Pacific high  
Subject: The Earth
    See subtropical high.
 
 
  
   Pahoehoe flow   
Subject: Geology
    A lava flow with a smooth-to-ropy surface. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Paleomagnetism   
Subject: Geology
    The natural remnant magnetism in rock bodies. The permanent magnetization acquired by rock that can be used to determine the location of the magnetic poles and the latitude of the rock at the time it became magnetized. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   paleomagnetism   
Subject: The Earth
    The study of ancient magnetic fields, which are preserved in the magnetic properties of rocks. ie. studying the changes in position of the magnetic poles, as well as reversals of poles in the geological past.
 
 
  
   Paleontology   
Subject: Geology
    The systematic study of fossils and the history of life on Earth. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   paleosol   
Subject: The Earth
    An ancient soil or soil horizon that formed on the surface during the geologic past.
 
 
  
   Paleozoic   
Subject: The Earth
    An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic (about 590-248 million years ago). Termed as the era of ancient life.
 
 
  
   Paleozoic Era  
Subject: Geology
    The oldest era of the Phanerozoic Eon. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
 
  
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