Types of Volcanoes according to their shape and status .ppt

volcanoes are classified according to their status and shape.

2. VOLCANISMVOLCANISM
•It refers to the phenomenon of eruption of
molten lava onto the surface
•It happens when magma find a path
through the lithosphere to the surface

3. A point on the earth’s crust where
magma forces its way to the surface
A hill, mountain, or fissure from
which molten rocks. Hot gases and
ash are ejected

4. What are the basic parts of the What are the basic parts of the
volcano?volcano?
ASH CLOUD
It is a mixture of rock, mineral, and
glass particles expelled from a
volcano during a volcanic eruption.

5. What are the basic parts of the What are the basic parts of the
volcano?volcano?
ASH CLOUD
It is where the lava and ash clouds
come out from
CRATER
It is a nearly circular depression that
surrounds the vent

6. What are the basic parts of the What are the basic parts of the
volcano?volcano?
ASH CLOUD
It is the molten rocks and is given off
when a volcano erupts.
CRATER
LAVA

7. What are the basic parts of the What are the basic parts of the
volcano?volcano?
ASH CLOUD
It is tube – like structure where
magma comes out of
CRATER
LAVA
VENT

8. What are the basic parts of the What are the basic parts of the
volcano?volcano?
ASH CLOUD
It is a pool of magma rocks
located underneath the ground
CRATER
LAVA
VENT
MAGMA CHAMBER

10. LAVA FLOW VS FISSURELAVA FLOW VS FISSURE
These are
streams of lava
that come out of
a volcano
A long narrow
cracks in the crust
where some
magma may come
out

11. CALDERACALDERA
•It is formed when the summit of a volcano
collapses as the source of magma is used
up.

12. Site Where Volcanoes are Site Where Volcanoes are
FormedFormed
CONVERGENT PLATE BOUNDARIES

14. Site Where Volcanoes are Site Where Volcanoes are
FormedFormed
DIVERGENT PLATE BOUNDARIES

15. Is a long, narrow chain of folds in
the oceanic crust produced by
diverging forces
It is the valley that separated
the ridges
It is the zone consisting of weak
materials that lie below the lithosphere

16. Site Where Volcanoes are Site Where Volcanoes are
FormedFormed
HOT SPOTS
Volcanic regions formed
when molten rocks materials
from the mantle find their way
out as hot plumes

18. NATURE OF MAGMANATURE OF MAGMA
VISCOSITY

19. TYPES OF MAGMATYPES OF MAGMA
1. GRANITIC MAGMA/RHYOLITIC MAGMA
-has the most silica content and highest
viscosity
2. BASALTIC MAGMA
-has the least silica content and is the
least viscous
3. ANDESITIC MAGMA
--between granitic and basaltic magma

20. Properties of the Different Properties of the Different
Types of MagmaTypes of Magma

21. VOLCANIC ERUPTIONSVOLCANIC ERUPTIONS

24. TYPES OF VOLCANIC TYPES OF VOLCANIC
ERUPTIONSERUPTIONS

25. TYPES OF VOLCANIC TYPES OF VOLCANIC
ERUPTIONSERUPTIONS

26. TYPES OF VOLCANIC TYPES OF VOLCANIC
ERUPTIONSERUPTIONS
A weak to
violent eruption
characterized
lava fountains
and outbursts
of molten lava

27. TYPES OF VOLCANIC TYPES OF VOLCANIC
ERUPTIONSERUPTIONS
An eruption that occurs when
gas rich (high water content),
pasty (high silica content)
lava accumulates to form a
dome on the volcano edifice
or beneath its surface

28. TYPES OF VOLCANIC TYPES OF VOLCANIC
ERUPTIONSERUPTIONS

29. TYPES OF VOLCANIC TYPES OF VOLCANIC
ERUPTIONSERUPTIONS

30. TYPES OF VOLCANOES TYPES OF VOLCANOES
According to Eruptive PatternAccording to Eruptive Pattern
COMPOSITE CONE / STRATOVOLCANO
•Volcanologists call these "strato-" or composite
volcanoes because they consist of layers of
solid lava flows mixed with layers of sand- or
gravel-like volcanic rock called cinders or
volcanic ash.
•Vesuvius (destroyed Pompeii) & Mount St.
Helens (in Washington State)

31. Composite (Stratovolcano)Composite (Stratovolcano)
•Mt. Vesuvius as seen
in Naples, Italy
•Safari Montage Movie
Mt. St. Helens

32. Cinder Cone VolcanoCinder Cone Volcano
•These are small volcanoes, usually only
about a mile across and up to about a
thousand feet high, grainy cinders and
almost no lava.
•They have very steep sides and usually
have a small crater on top.

33. Shield VolcanoShield Volcano
•Shield Volcanoes are made mostly of fluid
lava flows
•It is the calmest of the eruption types
•Shield volcanoes are the largest
volcanoes on Earth but are not very steep
•The Hawaiian Islands are composed of
chains of shield volcanoes.

34. Shield VolcanoShield Volcano

35. Types of volcanoTypes of volcano
Volcanoes can be active, dormant or extinct.
• A volcano is active, or alive, when it erupts often.
• When a volcano is dormant, or sleeping, it has not
erupted for a long time – but it might in the future.
• A volcano is extinct, or dead, when it hasn’t erupted
for at least 100,000 years.

36. Did you know?Did you know?
Pumice stone, which comes from volcanoes, is very light
because it contains lot of tiny bubbles. If there are enough
bubbles, then pumice stone can float on water!
Mount Kilauea, in Hawaii, is the
most active volcano on Earth
because it has been erupting
since 1983!
The word, ‘volcano’ comes from the name Vulcan, who was
the Roman god of fire.

37. VOLCANOES IN THE VOLCANOES IN THE
PHILIPPINESPHILIPPINES