TYPES OF VOLCANOES. Active Volcanoes examples

Volcanoes, it's types and examples

1. WHERE DO WE
FIND THE WORLDS
ACTIVE
VOLCANOES ?

3. “A volcano is a vent that
directly connects magma to
the surface of the Earth.”

4. 3 States of Volcanoes:
There are 3 states of volcanoes,
which are important to understand to
grasp the topic completely. These 3
states of volcanoes are:
1.Extinct Volcanoes
2. Dormant Volcanoes
3. Active Volcanoes

5. Extinct Volcanoes:
Extinct volcanoes are those volcanoes which have become dead
or extinct. Extinct volcanoes are declared extinct, and hence,
they will never erupt again.
Dormant Volcanoes:
Like the name suggests, Dormant Volcanoes are those volcanoes
that have been in the state of sleep or dormancy for a very long
period of time. Commonly, dormant volcanoes are those volcanoes
that have not erupted for at least 2,000 years ago. However,
dormant volcanoes are not extinct, and hence, can erupt at any
stage of time.
Active Volcanoes:
Unlike Extinct Volcanoes and Dormant Volcanoes, Active Volcanoes
are considered as immediate threats. Active Volcanoes are those
volcanoes that erupt lava, gases and/or show seismic activities. An
active volcano may have erupted recently, and is always at a risk of
erupting again.

6. Different Types of Volcanoes:
Geologists and professional volcanologists mainly classify four different
types of volcanoes. This classification of volcanoes is done on the basis of
shapes, magnitude, structure and materials of different volcanoes.
Furthermore, the way these volcanoes erupt is also a major factor in this
classification.
•Cinder Cones:
A relatively less-dangerous type of volcano, Cinder cones only grow to
about a1,000 – 1,200 ft. These cinder cones are usually created from a
single opening. The opening of a cinder cone is a cone-shaped structure,
while the steeps are formed of the erupted, fragmented cinders that fall
close to the chimney/vent.
Some Famous Cinder Cones Volcanoes:
Paricutin in Mexico
Lava Bute (Central Oregon in USA)
Sunset Crater (US in Arizona)

7. Shield Volcanoes:
shield volcanoes can be very, very big in size. However, they are not as much
dangerous as it seems. This is because the eruption of lava out of shield
volcanoes is not accompanied by pyroclastic material. This makes the eruption
relatively safer and it keeps the shield volcanoes safe, too.
The structure of shield volcanoes can be understood as tall and broad, but with flat
round shapes around it. In comparison with some of the other types of volcanoes,
shield volcanoes have low slopes.
Because of their large structures, shield volcanoes can be huge. For example,
Mauna Loa is a shield volcano that is over30,000 feetabove sea level.
Some Famous Shield Volcanoes:
Hualalai
Mauna Loa
Kohala Volcano

8. Composite Volcanoes:
Known as‘Strato Volcanoes’. Composite volcanoes are reasonably big and can
rise up to8,000 – 10,000 feet. Moreover, they can range anywhere from1 – 10
kmin diameter. The nature of composite volcanoes’ eruption is dangerous and
explosive in nature. With a lot of layers of lava and pyroclastic materials involved,
the eruption of composite volcanoes is considered noticeably dangerous.
Some Famous Shield Volcanoes:
Mt Fuji (Japan)
Mt Shasta (Califonia)
Mt Etna in Italy

9. Active Volcano
1.The volcano has erupted within historical
times.
2.Accounts of the eruptions were
documanted.
3.The volcano has erupted at least once
within the last 10 000 years.
The Philippines has more than 200 volcanoes
Mayon in Albay
Taal in Batangas
Kanlaon Negros oriental

10. LOCATIONS OF ACTIVE VOLCANOES
1.Eyjafjallajökull, Iceland–Icelandicfor “Island
mountain glacier”, Eyjafjallajokull eruption of 2010.
Hundreds of flights were cancelled

11. 2.Mount Vesuvius, Italy–
Buried the city of Pompeii in 79 AD –
Mount Vesuvius

12. 3.Sakurajima, Japan
•The lava connected the island to the mainland
– Sakurajima
The lava connected the island to the mainland – Sakurajima

13. 4.Mount Merapi, Indonesia–

14. 5.Mount Nyiragongo, D.R of Congo

15. 6.Ulawun, Papua New Guinea–

16. 7.Taal Volcano,Philippines

17. 8.Mauna Loa, Hawaii

18. 9.Galeras, Colombia

19. 10.Santa María,Guatemala