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Flashcards in Volcanic Eruption Deck (18):
1

The world's smallest active volcano:
- described as “crater within an island within a lake” because it stands as an island at Taal Lake.
- There have been 33 recorded eruptions of Taal since 1572.

Taal Volcano

2

An active stratovolcano in the province of Albay:
- Famous for its almost perfect conical shape
- most active volcano in the country, having erupted over 47 times in the past 400 years.

Mayon Volcano

3

Highest mountain in the country:
- large stratovolcano on the island of Mindanao, Philippines
- its name means “master” or “grandfather”

Mount Apo

4

ADVANTAGES OF VOLCANOES

- Serve as a foreign and local tourist attraction
- Help improve the quality of the surrounding soil by providing nutrients for crops.
- Their geothermal component is also an excellent source of energy and recreational facilities.

5

DISADVANTAGES OF VOLCANOES

When an eruption occurs:
- Pose a threat on the communities surrounding the volcano
- Bury adjacent communities in lahar and affect global climate
- People living in areas distant from the site can also be affected by the ash fall, poisonous gases, and lahar.

6

a vent on the earth’s surface that opens downward to a pool of molten rock, debris, and gases. Its formation involves the process of subduction

volcano

7

takes place when two plates converge

subduction

8

the place where the two plates converge and the volcano is formed (DOST-PHILVOCS, n.d.).

subduction zone

9

Reason for eruption

Accumulation of gases due to thickness of magma from silica content

10

Parts of volcanoes

- Volcanic bombs
- Ash, steam and gas
- Secondary cones
- Secondary vent
- Magma chamber
- Magma
- Lava
- Main vent
- Crater

11

large underground pool of magma

magma chamber

12

magma, once it reaches the surface

lava

13

bowl-shaped basin in the top of the volcano

crater

14

central tube which magma travels through

vent

15

eruptions from other vents may build up secondary cones on the flanks

secondary cones

16

material thrown out by the volcano

ash, steam and gas

17

larger material thrown out by the force of eruption

volcanic bombs

18

Volcanic Erruption Hazards

- Lava flow
- Pyroclastic flow
- Tephra falls
- Ballistic projectiles
- Volcanic gas
- Lahar