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   Habit  
Subject: Geology
    The distinctive growth shape of a particular mineral. Some minerals that grow with a highly elongate, fibrous habit, as shown here, are referred to as "asbestos." Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5thedition, Jon Wiley & Sons.
 
 
  
   haboob  
Subject: The Earth
    A dust or sandstorm that forms as cold downdrafts from a thunderstorm turbulently lift dust and sand into the air.
 
 
  
   Hadean Eon  
Subject: Geology
    The first eon on the geologic time scale. The eon ending 3.8 billion years ago that preceded the Archean eon. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Hadley cell  
Subject: The Earth
    A direct thermally-driven and zonally symmetric large- scale atmospheric circulation first proposed by George Hadley in 1735 as an explanation for the trade winds. It carries momentum, sensible heat, and potential heat from the tropics to the mid-latitudes (30 degrees). The poleward transport aloft is complemented by subsidence in the subtropical high pressure ridge and a surface return flow. The variability of this cell and the Walker cell is hypothesized to be a major factor in short-term climatic change.
 
 
  
   hail  
Subject: The Earth
    Precipitation in the form of lumps of ice associated with thunderstorms. Hail size usually ranges from that of a small pea to the size of cherries, but has been observed as large as oranges. Hail occurs most frequently during the summer when thunderstorm activity is at a peak. Extensive damage in the agricultural industry is caused each year by hailstorms.
 
 
  
   hailstones  
Subject: The Earth
    Transparent or partially opaque particles of ice that range in size from that of a pea to that of golf balls.
 
 
  
   hailstreak  
Subject: The Earth
    The accumulation of hail at the earth's surface along a relatively long (10 km), narrow (2 km) band.
 
 
  
   Half graben  
Subject: Geology
    A tilted fault block in which the higher side is associated with mountainous topography and the lower side is a basin that fills with sediment. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Half-life  
Subject: Geology
    The time required to reduce the number of parent atoms by one-half as a result of radioactive decay. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5thedition, Jon Wiley & Sons
 
 
  
   Half-life  
Subject: dinosaur
    The time required for one-half of the atoms of a radioactive substance to decay. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
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