Page 81 - Journeys Through Society-7

Types of Volcanoes
Active Volcanoes

Volcanoes that erupt frequently are called active
volcanoes. Most of the active volcanoes in the world
lie in the Pacific Ring of Fire belt which lies along the
Pacific Coast. Mt Etna in Italy is an active volcano.

World distribution of volcanoes
An erupting volcano
through which magma can be released to the surface.
The Hawaiian Islands have many such, volcanoes. AI Fact Technology Literacy
Volcanic eruptions occur in subduction zones which AI powered system can be trained with the help of
are created when two plates, usually an oceanic plate seismic data to analyse the magnitude and patterns of
and a continental plate, collide. The oceanic plate is earthquakes and predict the location of earthquakes
and aftershocks.
overlapped by the continental plate forming a deep
ocean trench just offshore.

Dormant Volcanoes
Volcanoes that have not erupted for a long time but
have chances of erupting in the future are called
dormant volcanoes. Examples of such volcanoes
include Mt Vesuvius of Italy.
Extinct Volcanoes
Volcanoes that have not erupted for at least 10,000
years, and are not likely to erupt at all are called extinct
volcanoes. Mt Kilimanjaro is an extinct volcano.

Brain Shaker
Did you know that volcanoes are like giant safety valves that
Mid-Atlantic Ridge
release the pressure that builds up inside the earth? It works
just like the safety valve of the pressure cooker which prevents
Wow Fact the pressure cooker from bursting. What do you think would

have happened if the hot gases inside would not have got a
There are more than 500 active volcanoes in
vent to come out on the surface?
the world. More than half of these volcanoes
are part of the “Ring of Fire”, a region that
encircles the Pacific Ocean.

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