Nature, products and types of Volcano - Rose Eden Canto

2. REVIEW

3. VOLCANOES

4. Learning Objective
At the end of the
lesson you will be able
to:
1.) Describe the
different types of
volcanoes;
2.) Differentiate
between active and
inactive volcanoes
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6. Once upon a time the ancient Romans
believed that Vulcan, god of fire and
metalworking, had a blacksmith shop on a
mountain on an island near Sicily, named
Vulcano. This is where the word "volcano"
came from. The end.

7. Volcano
•Volcanoes are very different
•Not formed by folding and
crumpling or by uplift and
erosion.
•Formed by accumulation of
their own eruptive products

8. Volcano
Eruptive products: lava,
bomb, tephra.
Vent/opening- is where the
materials are ejected.
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9. Volcano
•Buoyancy and gas pressure
force molten rocks upward and
break through weak zones of
earth's crust.
•Eruption begins, molten pour
from the vent as non-explosive
lava flows out it may shoot
violently into the air.
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10. Volcano
•Due to force of gravity, larger fragments fall
back around the vent.
•Finer materials carried by the wind only to fall
to the ground many
•miles away.
•Finest ash are ejected to the atmosphere and
carried around the
•world.
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11. Volcano
•Magma- molten rock
below the surface of the
earth
•Lava- ejected to flow on
the surface of the earth
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12. commonly contains
crystals, fragments of
surrounding rocks and
dissolved gases
ten miles
beneath the
ground
Upon cooling liquid
precipitates crystals
until solidification is
complete to form
igneous rocks
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Magma

13. Lava viscosity is
influence by
temperature, mineral
and water content
Red hot when
it pours out of
the vent
Very hot gas rich
lava contains-
silicon, sodium,
potassium and
flows
like hot tar
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Lava
Cooler gas poor
lava high in
silicon, sodium
and potassium
and flows
sluggishly

14. Volcano
•2 factors that determine
the type of eruption:
1. Silica
2. Water Content

15. a.) Silica type lava, lava flows freely
15
b.) Low-water, high silica type lava
(very viscous) produces pasty lava
which usually results in domes

16. 16
c.) In a high-water, low silica
(not viscous) lava, the eruption
appears as a fountain of runny
lava
d.) In a high-water, high silica
type (very viscous) lava, the
eruption is explosive.

17. VOLCANO
Products

18. mass of molten
rock materials
viscosity depends on
silica and water
content.
steeper slopes
encourage faster
lava flow
Lava
18

19. hot dry masses of fragmented
volcanic material that move
along the slope or ejected in
the atmosphere
These include: ash,
blocks and bombs
19
Pyroclastic material/ tephra

20. basic components
of magma or lava
maybe in the form of water vapor,
hydrogen sulfide, sulfur dioxide,
carbon monoxide or hydrogen
chloride.
The proportion of these
components changes
with changing
temperature.20
Volcanic gas

21. 3 types of
Volcanoes
.

24. Composite
Volcano
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26. Cinder cone
volcano
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28. Shield
volcano
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29. •Some of Earth's grandest
mountains
•Sometimes called
stratovolcanoes
• Typically, steep-sided,
symmetrical cones of large
base built by layers of lava
flows, volcanic ash, cinders,
blocks and bombs.
29
Composite
Volcano

30. •Rise as much as 8000 ft
above their bases
•Some of the most
conspicuous and beautiful
mountains in the world
are composite volcanoes
30
Composite
Volcano

31. Mount Mayon in the Philippines

32. Mount Fuji in Japan

33. Mount Shasta in California

34. Mount Hood in Oregon

35. Mount Rainier in Washington

36. •They have crater at the
summit which contains a
central vent or a
clustered group of vents.
•Lava either flow through
breaks in the crater wall
or come out from
fissures.
36
Composite
Volcano

37. •Simplest type of
volcanoes
•Built from particle
blobs of semi solid
lava ejected from a
single vent
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Cinder Cone
Volcano

38. •Most have a bowl-shaped
crater at the summit and
rarely rise more than a
thousand feet or so above
their surroundings.
•Generally not very tall, only a
few hundred meters because
gravity tends to cause the
loose cinders to slide off the
sides.
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Cinder Cone
Volcano

39. •Third type of
volcanoes
• Built almost
entirely of fluid
lava flows
39
Shield
Volcano

40. •Pours out in all directions
from a central summit vent, or
group of vents, building a
broad, gently sloping cone of
flat, domical shape.
• Hawaiian volcanoes are
known as shield volcanoes
because they resemble the
wide, rounded shape of an
ancient warrior's shield.
40
Shield
Volcano

41. •Tend to erupt non-
explosively mainly
pouring out huge volumes
of fluid lava.
•Some of the largest
volcanoes in the world
are shield volcanoes.
41
Shield
Volcano

42. “Climb To
The Top:
Smoke And
Ladders”
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43. https://www.geniusgames.
org/collections/science-
based-tabletop-games
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45. Why do we
need to study
Volcanoes?
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46. • What is a
volcano?
• What are the
parts of
volcanoes?
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47. • Where can
we find
volcanoes?
•What are the
different types
of Volcanoes?
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48. Summary/
Generalization
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49. EVALUATING
LEARNING
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56. THANK YOU