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Geol > HW 4 > Flashcards

HW 4 Flashcards

1
Q

What is defined as a vent out of which lava or pyroclastic debris spews onto the planet’s surface or into the air.

A

volcano

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2
Q

Molten rock underground is referred to as what?

A

magma

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3
Q

Molten rock above ground is referred to as what?

A

lava

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4
Q

Fill in the blank:

Mafic igneous rocks contain _________ than felsic igneous rocks

A

less silica

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5
Q

Which rocks tend to be lighter in color, felsic igneous rocks or mafic igneous rocks?

A

felsic

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6
Q

Which igneous rocks are formed above ground from cooled lava?

A

extrusive

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7
Q

Which igneous rocks are formed below ground from cooled magma?

A

intrusive

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8
Q

Granite is an example of what?

A

intrusive igneous rock

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9
Q

Which of the following has the highest viscosity

A

marshmallow cream

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10
Q

What is the defining characteristic of a shield volcano?

A

Broad, gentle sloping structure formed by low viscosity lava

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11
Q

Volcanoes tend to occur along what plate boundaries?

A

convergent

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12
Q

Hawaii is an example of what tectonic feature?

A

hot spot

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13
Q

Which of the following is not a type of volcano?

A

crater

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14
Q

The violent types of eruptions are known as what?

A

explosive

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15
Q

The gentler eruptions with more viscous lava are known as what?

A

effusive

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16
Q

The most dangerous type of eruption that includes a violent eruption and ashflow/fall is called what?

A

pyroclastic

17
Q

Which of these is not a classification of volcanic activity status?

A

intermittent

18
Q

Volcanic unrest can be detected by monitoring the changes in seismicity, heat flow, groundwater level, and gases.

A

true

19
Q

Which of the following are volcanic hazards?

A

Lava flows
Lahars
ALL OF THESE
Ash fall and ash clouds

20
Q

There are active volcanoes in the contiguous United States as well as Alaska and Hawaii.

A

true

Geol (16 decks)

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