Geothermal Energy and Iceland * Geothermal energy is heat from the Earth * Found underground; sometimes shallow, sometimes deep (to the magma layer) * Most of the energy comes from the (31) of radioactive minerals (ie: uranium and potassium) * Iceland at the forefront of geothermal energy for heating and electricity production (currently it supplies 25% of the country's electricity production) * 84% of energy use is from domestic renewable resources (66% is geothermal) * In the 20th century, Iceland changed from a poor country to one with a high (32) * Iceland is on a geological fault line * The North American and Eurasian tectonic plates move at (33) cm annually * Creates a lot of volcanic activity and regular (34) (not usually dangerous) * Lots of volcanoes (more than 200) and hot springs * Approx. 30 volcanoes have erupted since Iceland was populated * Iceland's geothermal energy comes from 2 types of hot water systems: Found in the (35) or nearby Usually at altitude The rock is young and permeable Groundwater is deep Shown at surface usually as (36) Found usually in southwest Iceland Shown at surface usually as hot or boiling springs Flow rates from almost zero to 180 litres a second These fields are thought to be (37) (existing a few thousand years) |