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Volcanic Hazards Flashcards

(6 cards)

1
Q

Pyroclastic Flow

A

Mix of hot rock, lava, ash and gases

More common with andesitic lava

Often occur at subduction zones

Move at around 200m/s

Can travel large distances

Temperatures of 350oC - 1000oC

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2
Q

Nuee Ardente

A

Means ‘glowing cloud’

Contain more dense material

Are normally only found 50km from source

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3
Q

Tephra

A

Rock fragments ejected during an eruption

Large fragments land close to the source

Small fragment (ash) can travel great distances

Ash can cause breathing difficulties, block sunlight and alter temperatures

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4
Q

Lahar

A

Ash and volcanic material mix with water

Commonly occurs in glaciated areas due to the rapid melting of the ice

Flows at speeds upto 60km/h

Can be highly erosive

Will engulf anything they pass over

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5
Q

Lava Flows

A

Lava flows down the side of a volcano

Low viscosity lava travels at 10km/h and may cover hundreds of kilometers

Slow flow rate allows for evacuation

Will destroy anything it passes over

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6
Q

Gases & Acid Rain

A

Co2 and SO2 are released upon eruption

Can cause breathing difficulties and harm wildlife

Gases react with water vapour creating acid rain

Damages ecosystems and infrastructure

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