Lesson 3 Flashcards
(12 cards)
______ are observable facts that are arising due to volcanic activity such as eruption. These have potential threat, for seeable crisis that directly affect to human beings, animals, properties, infrastructure, tourism, and even political stability to mention some within a specific period of time.
Volcanic hazards
Volcanic eruption is one of the dangerous event that may happen because it results to different hazards such as:
Ballistic projectiles,
Ash fall,
Pyroclastic flows,
Lava flows,
Volcanic gases,
Debris Avalanche or Volcanic landslide Tsunami.
Lahars
____ are rock fragments that are ejected from volcano’s mouth that are comparable to cannonballs
Ballistic projectile
____ are rock fragments that are ejected from volcano’s mouth that are comparable to cannonballs
Ballistic projectile
are minute volcanic particles such as pulverized rock, minerals and silicon which has fine to coarse grain.
Ash fall or Tephra fall
This is formed during explosive volcanic eruption when dissolve gages in magma escape violently into the atmosphere.
ash fall or Tephra fall
_____ contain a highly-density mix of hot lava blocks, pumice, ash and volcanic gases. They move at very high speed down volcanic slopes, typical following valleys.
Pyroclastic Flows
are streams of molten rocks that are poured or oozed from an erupting vent
Lava flows
. Magma contains dissolve gases which provides the driving force that causes most volcanic eruptions. As magma rises towards the surface and pressure decreases, gases are released from the liquid portion of the magma (melt) and continue to travel upward and are eventually released into the atmosphere (
Volcanic gases
massive collapse of a volcano, usually triggered by an earthquake or volcanic eruption
Debris Avalanche or Volcanic landslide
– sea waves or wave trains that are generated by sudden displacement of water (could be generated during undersea eruptions or debris avalanches)
Tsunami
- a destructive mudflow on the slopes of a volcano.
LAHARS
