The Philippines is located along the Ring of Fire. As a result, it is a home to many volcanoes. According to PHIVOLCS, our country is an ideal site for any volcanic activity. It is therefore important for us to know how this natural phenomenon happens to reduce the risks and effects it may cause.

1. Good morning!

3. I Am a mighty Volcano!
What can you say about the two pictures?

4. —Someone Famous
Objectives: At the end of the discussion the
students can:
A. Characterize a volcano
B. Describe the different types of
volcanoes
C. Classify volcanoes according to their
record of eruption and shape
D. Value the importance of knowing the
geographical location of the volcanoes
in the Philippines.

5. …
What is a volcano? A volcano is an opening in the
earth's crust through which
lava, volcanic ash, and gases
escape. Volcanic eruptions
are partly driven by pressure
from dissolved gas, much as
escaping gases force the cork
out of a bottle of champagne.

6. There are several ways by which volcanoes
can be classified. PHIVOLVS have adapted a
system where the Philippine volcanoes as active
and inactive.
ACTIVE VOLCANOES
Active volcanoes are those that have a record
of eruption within the last 600 years of those that
erupted 10,000 years ago based on analysis of their
materials.
Ex. Taal and Mayon

7. INACTIVE VOLCANOES
Inactive volcanoes are those that have
not erupted for the last 10,000 years and their
physical form is being changed by agents of
weathering and erosion through formation of
deep and long gullies
Ex. Mount Alu and Mahagnao Volcano

8. Activity: Volcanoes in the Philippines

9. Questions:
1. Are all the volcanoes found in the same
location?
2. Which of the volcanoes had the most number
of eruptions? Least number of eruption? And no
record of eruption?
3. How will you classify the volcanoes that have
records of eruptions?
4. How will classify the volcanoes with no record
of eruption?

10. Volcanoes come in different shapes and
sizes and each structure has a unique
history of eruption. Volcanologist have
been able to classify them according to
their landforms and eruptive patterns,
namely: Shield volcanoes, cinder cones
and composite cones.

11. Types of Volcanoes
According to Their
Landforms and
Eruptive Patterns.

12. It is a type of volcano that is
characterized by its broad,
gently sloping shape and
relatively fluid lava flows.
Shield volcanoes are typically
formed by the eruption of low-
viscosity lava that flows easily
over long distances, creating a
wide, shield-like shape.
What is a
Shield
Volcano?

13. What is a
Shield
Volcano?
Mauna Loa in Hawaii
Mt. Kanlaon,
Philippines

14. It is a type of volcano that
they may look like an
idealized depiction of a
volcano as they are steep,
conical hills that usually
have a prominent crater at
the top.
What is a
Cinder
Cone?

15. What is a
Cinder
cones?
Taal Volcano,
Philippines
Lava Butte, USA

16. Composite volcanoes
are tall, symmetrically
shaped, with steep sides,
sometimes rising 10,000 feet
high. They are built of
alternating layers of lava
flows, volcanic ash, and
cinders.
What is a
composite
cones?

17. What is a
Composite
cones?
Mt. Fuji, Japan
Mayon
Volcano,
Philippines

18. Activity
Time!

19. Composite Cone Cinder Cone

20. Composite Cone Shield Volcano

21. Cinder Cone Composite Cone

23. Assignment:
Conduct a web investigation
about the types of volcanic eruptions
with definition and examples. Write
your answers in your notebook.

25. Thank you!