Paragraph 2: By far the most abundant form of geothermal energy occurs at the
relatively low temperatures of 80° to 180° centigrade. Water circulated
through heat reservoirs in this temperature range is able to extract enough
heat to warm residential, commercial, and industrial spaces. More than 20,000
apartments in France are now heated by warm underground water drawn from a
heat reservoir in a geologic structure near Paris called the Paris Basin.
Iceland sits on a volcanic structure known as the Mid-Atlantic Ridge.
Reykjavik, the capital of Iceland, is entirely heated by geothermal energy
derived from volcanic heat.
Paragraph 3: Geothermal reservoirs with temperatures above 180"
centigrade are useful for generating electricity. They occur primarily in
regions of recent volcanic activity as hot, dry rock; natural hot water; or
natural steam. The latter two sources are limited to those few areas where
surface water seeps down through underground faults or fractures to reach
deep racks heated by the recent activity of molten rock material. The world's
largest supply of natural steam occurs at The Geysers, 120 kilometers north
of San Francisco, California. In the 1990s enough electricity to meet about
half the needs of San Francisco was being generated there. This facility was
then in its third decade of production and was beginning to show signs of
decline, perhaps because of overdevelopment. By the late 1990s some 70
geothermal electric-generating plants were in operation in California, Utah,
Nevada, and Hawaii, generating enough power to supply about a million people.
Eighteen countries now generate electricity using geothermal heat.
7. Which of the following can be inferred from paragraphs 2 and 3 about
geothermal reservoirs?
O Volcanic heat is associated only with geothermal reservoirs that have a
temperature over 180" centigrade.
O More countries produce power from geothermal reservoirs than use them
for heating buildings.
O Most geothermal reservoirs are suitable for producing electricity.
O A higher geothermal reservoir temperature is needed to generate
electricity than is needed to heat homes.
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