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   Laccolith  
Subject: Geology
    A lenticular pluton intruded parallel to the layering of the intruded rock, above which the layers of the invaded country rock have been bent upward to form a dome. Reference: Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
 
  
   Lag time   
Subject: Geology
    Lag time The amount of time between a rainstorm and the occurrence of flooding. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Lagoon  
Subject: Geology
    A bay inshore from an enclosing reef or island paralleling a coast. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
 
  
   Lahar   
Subject: Geology
    Debris flows on the slopes of volcanoes that result when unstable layers of ash and debris become saturated and flow downslope, usually following stream channels. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Lake lacustrine (lake)  
Subject: Geology
    A water body that has an upper surface exposed to the atmosphere and has no appreciable gradient (that is, the surface is relatively flat). Ponds (small, shallow lakes) and wetlands (areas of poor surface drainage, such as marshes and swamps, which may contain standing water during some seasons) are included under the general definition of a lake. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
  
   lake-effect snows  
Subject: The Earth
    Localized snowstorms that form on the downwind side of a lake. Such storms are common in late fall and early winter near the Great Lakes as cold, dry air picks up moisture and warmth from the unfrozen bodies of water.
 
 
  
   laminar flow  
Subject: The Earth
    A non-turbulent flow in which the fluid moves smoothly in parallel layers or sheets.
 
 
  
   Laminar flow   
Subject: Geology
    The movement of water particles in straight-line paths that are parallel to the channel. The water particles move downstream without mixing. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Lamprophyre  
Subject: rock
    Lamprophyre is a group name of dike rocks. Their composition can vary and they are often altered.
 
 
  
   LAN  
Subject: The Earth
    LAN : LAN stands for local-area network, a system for connecting computers so they can communicate with one another.
 
 
  
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