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Geo Lab > Volcanoes > Flashcards

Volcanoes Flashcards

1
Q

Lava flow

A

melted rock that flows across the land

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2
Q

pyroclastic debris / tephra

A

ash/rock that is blasted by gases into the air and falls back to the surface

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3
Q

Volcanoes are created from accumulating…

A

lava, pyroclastic material, or a combonation of both

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4
Q

what in magma/lava causes it to become thick

A

silica

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5
Q

viscosity

A

magma’s resistance to flow

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6
Q

mafic lava

A

low viscosity
less than 50% silica

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7
Q

intermediate lava

A

high viscosity
50 to 64% silica

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8
Q

felsic lava

A

high viscosity
65% to 70% silica

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9
Q

volcano eruption styles related to (2)

A

composition and viscosity

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10
Q

caldera

A

collapse feature formed from volcanic eruptions that empty magma chambers

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11
Q

crater

A

bowl-shaped area that surrounds the volcano’s vent

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12
Q

explosive eurptions

A

volcanoes release clouds of ash and avalanches of debris by blasting; common with thick lava that traps gases

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13
Q

effusive eruptions

A

volcanoes release only flows or fountains of lava; common with very hot, fluid/runny lava

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14
Q

lava fountian

A

lava spurts into the air due to rapid expansion of gas bubbles

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15
Q

lava lakes

A

formed when lava pools within the crater that surrounds the volcano’s vent

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16
Q

sheild volcanoes (4)

A

-formed by thin lava flow (malfic)
-very large, broad with gentle slopes
-largest
-hazards: tephra, vog

17
Q

cinder volcanoes (3)

A

-formed from fine-grained tephra
-small with moderate slopes
-hazards: ash, tephra, lava flows sometimes

18
Q

composite / stratovolcanoes (4)

A

-formed from thick lava
-large with steep slopes
-violent eurptions
-all hazards

19
Q

hazards

A

lava flow
tephra
pyroclastic flow
lahar
eurption column

20
Q

lava domes (3)

A

-formed from thick lava
-Small, steep sided features that are the result of thick lava piles
-often form in craters

Geo Lab (12 decks)

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