Chapter 6 Science Flashcards

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1
Q

volcanoes

A

a consequence of moving plates

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2
Q

where does volcanic activity occur?

A

convergent and divergent plate boudaries plus hot spots

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3
Q

silica in magma

A

more high viscosity, less low viscosity

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4
Q

fissure eruptions/ flood basalts

A

lava plateau, assocaited with MOR’S and hot spots creates lava flow. low viscosity

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5
Q

the cascades

A

a chain of volcanoes that are close to each other

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6
Q

why is the chain of volcanoes here?

A

converget plate boundary, ocean countaine boundary

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7
Q

why arent these volcanoes always erupting?

A

magma needs to fill up

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8
Q

prediciting volcanic eruptions

A

shape, seismic activity, gasses, spikes in co2

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9
Q

Volcanoe types

A

Shield volcanoes, stratovolcanoes, cinder cone

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10
Q

shield volcanoes

A

broad, gently sloping sides built up from thousands of fluid, low viscosity lava flows, rise from the ocean floor, found above oceanic hot spots, or divergent plate boundaries

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11
Q

stratovolcanoes

A

steep sided, cone shaped, form along convergent boundaries, violent style of eruptions, composed of many layers of airborne volcanic debris, pyroclastic flow deposits

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12
Q

what can shield volcanoes become?

A

stratovolcanoes from viscous magmas of shield volcanoes

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13
Q

what type of volcanoes have narrower base and more steeply sloping sides?

A

stratovolcanoes

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14
Q

what is the smallest type of volcanoes?

A

cinder cone

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15
Q

Cinder cone

A

composed of coarse tephra produced when gas escapes rapidly from molten lava, easily eroded, simplest

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16
Q

which type of volcanoe can occur on a strato or a shield?

A

cinder cone

17
Q

other volcanic landforms

A

calderas, lava plateaus, geysers, hot springs, fumeroles, and mud volcanoes

18
Q

Caldera

A

a crater that forms when a stratovolcano or shield volcano collapses into a shallow, empty magma chamber below the volcano

19
Q

lava plateaus

A

low viscosity lava that reaches the surface through fissures. layers of solidified basalt lava, released volumes of volcanic gases, very dangerous, doesn’t require eruption