Geyser
A geyser is the
result of underground water under the combined conditions of high temperatures
and increased pressure beneath the surface of the earth. Since temperature
rises approximately 1 F for every sixty feet under the earth's surface, and
pressure increases with depth, the water that seeps down in crack and fissures
until it reaches very hot rock in the earth interior becomes heated to
temperature in excess of 290 F. Because of the greater pressure, the water
shoots out of the surface in the form of steam and hot water. The result is a
geyser. In order to function, then a geyser must have a source of heat,
reservoir where water can be stored until the temperature rises to an unstable
point, an opening through which the hot water and steam can escape, and
underground channels for resupplying water after an eruption.
Favorable conditions
for geyser exist in some regions of the world including New Zealand, Iceland,
and the Yellowstone National Park area of the United States. The most famous
geyser in the world is Old faithful in Yellow Park. Old faithful erupts
almost every hour, rising to a height of 125 to 170 feet and expelling more
than ten thousand gallons during each eruption.
1.
How
geyser is produced?
A. by the rise of temperature
pressure functioning hot steam.
B.
from
a huge tension of heated water that coming out
from the earth crack.
C.
from
the heated temperature in earth crack that absorbing
water.
D. from the temperature and absorbed
water that occurs on earth surface.
E.
by the hot water and temperature of hot rock that occurs on earth
surface.
2. Steam and hot water shoot out of
the surface because of ....
A. hot rock and water D.
temperature and pressure
B. greater pressure E.
high temperature and increased pressure
C. underground temperature and
increased pressure
3. "... and expelling
more than ten thousand gallons during each eruption." (Paragraph 2)
The underlined word is closest in meaning to ....
The underlined word is closest in meaning to ....
A.heating D. Melting
B. wasting E.
supplying
C. discharging
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