Slides in this set
Fossil fuels such as coal, oil and gas are non-
there are renewable resources that can be gained
from the Earth, geothermal energy.
There are three main types of geothermal energy:
1) In volcanic areas
2) Hot Rocks such as granites in Cornwall
3) Hydrothermal fluids in sedimentary basins -
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
Geothermal volcanic areas
As long as the
water is pumped
back this form of
energy is virtually
occur in Italy, New
Japan, Russia and
·In a potentially dangerous area.
·The steam can be corrosive and
·Not common.…read more
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
They therefore produce more heat and have a
steeper geothermal gradient 40°C/km.
Therefore it gets hotter quicker with depth.…read more