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EARTH & SCIENCE 9
Lusson Based Reviewer |
Quarter 2
Topic Outline:
Parts of a Volcano
Active & Inactive Volcanoes
Types of Volcano According to Shapes
Volcanic Eruptions
Viscosity
Factors Affecting the Volcanoes' Eruptive Style
Types of Volcanic Eruption
Geothermal Energy
Factors Affecting Climate
VOLCANO
A volcano is an opening in Earth's crust that allows molten rock from the Earth's interior to reach the surface that may cause violent and spectacular eruptions.
PARTS OF A VOLCANO
MAGMA CHAMBER
-Large pool of molten rock (magma) found underneath the earth's crust
MAIN WIND/DUCT
-Primary opening of the volcano through which the magma and other rocks and gasses flow out
SIDE VENT
-Secondary opening at the side of the volcano through which magma reaches.
the surface
CRATER
-Mouth of the volcano which is a funnel-shaped or bowl-shaped depression. at the top of the vent from where volcanic materials come out
ASH CLOUD
-Cloud of ash that forms in the air after some volcanic eruptions
ENOUGH
-Molten rock which is given off onto the surface of the earth when a volcano erupts
LAYERS OF ASH AND LAVA
-Volcanic materials (ash and lava) that settled and solidified over successive eruptions
ACTIVE VOLCANOES
have had at least one eruption during the
past 10,000 years
Might be
Erupting
-experiencing an eruption or showing regular activity like emission of gasses, ash or lava
Dormant
-have not erupted for a very long time but may erupt at a future time
The PHIVOLCS said there are a total of 24
active volcanoes in the Philippines Dormant or Potentially Active
Volcanoes
-morphologically young-looking that has no historical or analytical records of eruption but could erupt in the future.
Long-dormant System
-might refer to a volcano that has not erupted in thousands of years
Recently Active System
-might have erupted a few years or decades (or even centuries) ago
Restless
-these are volcanoes that are not erupting, but that are experiencing some signs that magma is accumulating or
moving beneath the surface
EXTINCT OR INACTIVE VOLCANOES
Have not erupted for the last 10,000 years
Do not show any signs that a possible eruption or any volcanic activity will occur in the future
-magma supply is cut off
Physical form has been altered by agents of weathering and erosion with the formation of deep and long gullies
The PHIVOLCS currently lists 35 volcanoes
in the Philippines as inactive
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