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Diasters 2023 > Volcanoes > Flashcards

Volcanoes Flashcards

1
Q

Subduction zone

A

Converging plate boundary creating a magma plume

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2
Q

Ring of fire

A

Volcanoes rim the Pacific Ocean

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3
Q

Convergent plates

A

O.C. Vs O.C.
O.C. Vs C.C.
NEED O.C.

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4
Q

Hotspot volcanoes

A

O.C. = shield volcano
C.C. = super volcano

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5
Q

Sediment in subduction zone

A

Allows melting point to be lower (600/800 C)
Makes magma thicker

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6
Q

Shield volcano

A

Effusive (none exploding)
Hawaii
Low viscosity magma (thin)
Largest type
Hotspot

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7
Q

Strato volcano / composite cones

A

Explosive
Typical mt volcano

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8
Q

Silica content

A

More (high) silica = more thick
Less (low) silica = more thin

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9
Q

Gas content

A

Determines the strength of explosion
Expands 1000x
Absorbed by magma until it explodes

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10
Q

Pyroclastic / Ash flow

A

Rock/Ash/lava (dry material)
Flow surge

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11
Q

Lahar

A

When the materials of a pyroclastic flow mix with water
Becomes a thick concrete like mud slide that’s as hot as lava

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12
Q

Supper volcano

A

Igneous rock
VERY explosive
Hotspot

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13
Q

Caldera

A

After a super volcano erupts it collapses into a Caldera

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14
Q

VEI scale

A

0-8
1-2 = non explosive (Hawaii)
3-6 = explosive
7-8 = super volcano / catastrophic

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15
Q

Cinder cones

A

Mini volcanoes
Pop up randomly
Erupts 1 once
Produces cinder
Non-deadly

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16
Q

Volcanic soil

A

Good for farming, especially tropical food

17
Q

Geothermal power

A

Creates energy for urban areas via the heat produced by the magma

18
Q

Mineral resources

A

Gold/silver (non metallic rocks)
Materials used for building stones, roads, and rail lines

19
Q

Magma temperature

A

Colder = thicker
Warmer = thinner

20
Q

VEI scale nomenclature / history

A

Plinian meant explosive in the old scale

21
Q

Rhyolitic / pumice rock

A

From explosive volcanoes

22
Q

Basalt rock

A

From hot spot volcanoes

Diasters 2023 (3 decks)

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