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Geoscience > Volcanoes > Flashcards

Volcanoes Flashcards

0
Q

What kind of Volcano has a gentle slope, Hawaiian islands, and very runny lava?

A

Shield

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1
Q

What are the 4 types of volcanoes?

A

Cinder cone, shield, lava dome, and strato volcano

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2
Q

What does viscosity mean?

A

The resistance to flow

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3
Q

What kind of volcano is made of small rock fragments that fall around the vent! and are short?

A

Cinder cones

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4
Q

What is pyroclastic flow?

A

A flow that is extremely fast, has a lot of gas, tephra, and is very dangerous

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5
Q

What is a supervolcano?

A

A volcano that produces and ejects more than 1000 km cubed of tephra

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6
Q

What is a caldera?

A

A dried crater

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7
Q

Which kind of volcano has very thick, viscous lava that can seal the vent?

A

A lava dome

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8
Q

What does viscosity mean?

A

The resistance to flow

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9
Q

What is a lahar?

A

A mudflow that comes from a volcanic eruption

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10
Q

What is aa lava flow?

A

Rough and jagged blocks

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11
Q

What are the 3 super volcanoes on earth?

A

Yellowstone, Long valley, and valley caldera

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12
Q

Pumice

A

Very light

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13
Q

Basalt

A

Dark fine-grained volcanic rock

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14
Q

Obsidian

A

Naturally occurring volcanic glass, extrusive

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15
Q

What is a hotspot?

A

A small area with a hot temperature

16
Q

Series of island with hotspot?

A

Hawaiian Islands

17
Q

Andestic rocks

A

They have properties of both mafic and felsic rocks

18
Q

Define subduction

A

Subduction is when one plate dips beneath another

19
Q

What is molten rock also known as?

A

Magma

20
Q

Which layer of the surface is the thickest?

A

The mantle

21
Q

What are four things that can be ejected from a volcano?

A

Hot magma, rock, ash , and gases

22
Q

How does lava silicate content affect viscosity?

A

The higher the silica, the higher the viscosity

23
Q

Gases effect explotivity?

A

The more the gas, the higher the chance of greater explotivity

24
Q

What are the five different textures of igneous rock?

A

Coarse-grained, fine grained, porphyritic, glassy, and vesicular

25
Q

What does porphyritic mean?

A

A mix of large and small crystals

Geoscience (6 decks)

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