Volcanoes are formed when molten rock called magma flows out of the earth through openings called vents. The magma accumulates on the surface from the interior of the earth. The funnel-shaped depression at the top of a volcano is known as a crater, where lava and other material erupt or are silently released. Volcanoes can be active and frequently erupt, extinct and will not erupt again, or dormant where they were active previously but may erupt again in the future.

2. KERALA UNIVERSITY COLLEGE OF
TEACHER EDUCATION IN
NEDUMANGADU
THIRUVANANTHAPURAM
NAME : ROHINI.S.M
OPTIONAL SUBJECT : SOCIAL SCIENCE
REGISTER NUMBER : 13983027

4. Volcanoes are caused when molten
rock (magma) flows out onto the earth’s
surface though fissures that are caused due to
the movement of plates.
The fissures, through which the magma
comes out from the aesthenosphere on to the
crust of the earth is known as the vent.
The rock and other material which come on
to the surface of the earth from the interior of
the earth accumulation.

5. The funnel shaped depression that can be
seen on the summit of a volcanoes is known
as a crater.
Some volcanoes erupt the lava out with a
great explosion and some others, silently.

7. DIFFERENT TYPES OF VOLCANOES
ACTIVE EXTINCT DORMANT
Those that
frequently
erupt.
Eg : mount
Etna in Italy,
Active at a time.
But will not
erupt again.
Eg : Kilimanjaro
in Africa
Those that have
erupted earlier
and not active in
the recent past.
But can become
active.
Eg : Vesuvius in
Italy

8. THANK YOU