The types of volcanoes are-
Active volcanoes. These volcanoes keep on ejecting
volcanic material at frequent intervals. The Etna volcano of Italy has been
active for the last 2500 years. The Stromboli volcano of Sicily Island explodes
after every 15 minutes and is known as the Light house of the Mediterranean.
Dormant or sleeping Volcanoes. The dormant volcanoes are
those in which eruption has not occurred regularly for a long time. But they
cause great damage to life and property when they suddenly becomes active after
remaining dormant for a sufficiently long time. Visuvius volcano of Italy has
exploded only 10 times in about 1500 years.
Extinct or Dead
Volcanoes. The vent
of an extinct volcano is blocked and its crater is filled with rain water to
form a crater lake. Vegetation starts growing on it. The possibility of future
explosion becomes remote. Many time an extinct volcano suddenly becomes active.
This has happened in case of Krakatoa volcano. The Island of Krakatoa is
situated in the Sunda Strait between the Island of Java and Sumatra. Its
eruption in the year 1883 blew off the top of the mountain by an explosion
which caused tidal waves about 16 meters high, killing 36000 people in west
java. The sound of explosion was heard as far as Istambul (Turkey) in the west
and Tokyo in the east. The volcanic dust and gases encircling the globe in the
atmosphere caused strange sunrise and sunset conditions for about three years.
Today Krakatoa is only a low Island with a lake inside its crater.
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