2. OBJECTIVES
1. describe the structure of a volcano;
2. describe the different types of volcano based on structure,
and activity;
3. give examples of the types volcanoes which are found in
the Philippines;
4. describe the different types of volcanic eruption; and,
5. create an advocacy material or activity that will help raise
awareness about the signs of an impending volcanic eruption.
3. Here are some key questions for you to
ponder as you go over this module:
1. What is the structure of a volcano?
2. How are volcanoes classified?
3. What are the examples of volcanoes found in the
Philippines?
4. What are the different types of volcanic eruption?
5. What advocacy material can be created to raise
awareness on the signs of impending volcanic eruption?
4.
5. What is Volcano?
• The term “Volcano” refers to mountain or hill,
typically conical, having a crater or vent in which
lava, rock fragments, hot vapor, and gas are or
have been erupted from the earth's crust.
6. External Parts of Volcanoes
⮚ Summit is the highest point or the apex of
the volcano. At the summit, you have an opening
called vent.
⮚ Slopes are the sides or flanks of a volcano
that radiate from the main or central vent.
⮚ Base is lower outer part of the volcano.
7.
8. What are the different features or parts of
Volcanoes?
Magma Chamber is a region beneath the vent of a
volcano where molten rock or magma is deposited or
stored before eruption.
Main Vent is the main opening or outlet on the surface
of a volcano that emits lava, gases, ash or other volcanic
materials.
Conduit is an underground central tube-like or pipe-
like structure of a volcano that connects the magma
chamber to the crater through which the magma travels.
9. Side Vent is a smaller outlet through which magma
escapes. Crater is the mouth of the volcano which is
a funnel-shaped or bowl shaped hollow at the top of
the vent from where magma, ash and gas comes out.
Lava is a molten rock which is given off onto the
surface of the Earth when a volcano erupts.
Ash and Gas Cloud is a of mixtures of rock,
minerals, glass particles and gases expelled or pushed
out of the volcano during volcanic eruption.
