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Geothermal in volcanic areas
The water may reach 200°C.
This water either reaches the
surface as geysers or is tapped
into via boreholes.
In this example 100,000 Kg/h of
steam at 8 atmospheres
pressure turns 255 mega watt
turbines to produce 110 mega
watts of power.
Once the steam has cooled
and condensed the water is
pumped back underground.…read more

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Geothermal volcanic areas
As long as the
water is pumped
back this form of
energy is virtually
renewable.
Other examples
occur in Italy, New
Zealand, Mexico,
Japan, Russia and
Iceland.
Problems:
·In a potentially dangerous area.
·The steam can be corrosive and
dangerous.
·Not common.…read more

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There are hot dry rocks
where there is no naturally
occurring hot water brought
to the surface.
hot rocks are associated
with granites that contain
a higher proportion of
radioactive elements than an
average rock.
They therefore produce more heat and have a
steeper geothermal gradient 40°C/km.
Therefore it gets hotter quicker with depth.…read more

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