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GEOTHERMAL ENERGY





ALONG  WITH   hydro power and  fossil  fuels  the  Earth  has   other  resource  of  energy  as  well.these  include  geothermal   heat  which  comes  from  the  depth  of  the   Earth.The  heat  of  the  Earth   normally  comes    out  on  the  surface . in   destructive  ways   in  many   volcanic   regions, and  at   other  places   such  as Iceland   this  heat  is   released  through "quiet    volcanism"high  temperatures  prevail  deep  inside   the  Earth's  surface,  which  can  be  used  to  produced   energy   with  the  help  of  geothermal  power  plants.Energy  can   also  be   obtained   from   plants   in  the    form  of  bio gas    or  fuel  from  sugarcane ,  which  is   used   to   run  a number  of   cars  in  countries   like  Brazil.
HOW  DO   GEOTHERMAL  POWER   WORK   Geothermal   power  plants  covert  the  thermal  energy  of  the  Earth   into  electricity .This   is  truly   worthwhile    in  those  areas   where  the  upper   layers  of   the  Earth  have  a temperature  of  more  than 100degree  C,such  as  Iceland   or  several  parts  of Italy .Hot  steam  at  a  temperature   of  over 150degreeC.  can  be  used  directly   to  drive  the  turbines.Other processes    that  use   the  heat   of  the  Earth   at  a  depth  of   several   kilometers   are  still   in  the  trial   stage.In  these  processes   ,water  is  pressed  at  a    high  pressure  in hot  rocky  layers,where  it  heats  up   in  artificially   created    cracks.From  there ,  it  is  pumped  again   to  the Earth's  surface  by  means of  a  second    drill.This  heat  can  be  used  directly   for  heating   or  for  generating  electricity.

 BIO GAS     -Bio gas    is  a  mixture  of   gases  released   when  the  remains  of   plants  rot  in  the  absence  of oxygen .This  happens in  a  natural  way in  dung  heaps,  as  also   in  compost  plants,garbage  dumps  and  crops..In  large  bio gas  plants   the  remains  of  plants  are  decomposed  by  bacteria  in  an  air  tight  tank..The  released   gas  is   highly  combustible   because  of  its  high  methane  content..The   has   almost  unlimited  supply  of plants  remains,    which  make  bio gas   an  important  source  of  energy   from  renewable   raw  materials.It  can  be  used  as  gas  for  heating  or  for  generating  electricity.It  can  also  be  liquefied.  easily   and  used  as  fuels   for  vehicles.

 INTERESTING  FACTS
  • The   walk  ways  and  streets  in  Iceland   are    heated  through  geothermal  energy.
  • The   heat  in  the  upper  3  km  of  the  Earth's  crust  would   theoretically    be  sufficient  to  provide  us   with  energy  for 100,000 years.
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  • The  original    inhabitants   of  New Zealand  ,  the   Maori,sometimes   bake   bread  directly    in  the  warm  cracks  of  the  Earth.These  cracks   get  heated  as  a  result  of   the  volcanic  activity   in  the  northern  island   of  the  two    New Zealand   island.
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