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Earth Science > Test #3 > Flashcards

Test #3 Flashcards

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1
Q

True or false: volcanoes can form underwater

A

true

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2
Q

True or false: the largest volcanoes are cinder cones

A

false; composite

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3
Q

True or false: large amounts of gases are released during a volcanic eruption

A

true

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4
Q

True or false: molten rock beneath Earth’s surface is called lava

A

false; magma

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5
Q

True or false: a seismogram is created by a seismograph

A

true

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6
Q

the modern scale used by scientists to measure the magnitude of an earthquake is called the Richter Scale

A

false: moment magnitude

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7
Q

What is the benefit of volcanoes

A

increased tourism

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8
Q

Which tectonic plate does the Ring of Fire surround?

A

Pacific

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9
Q

which of the following is not considered to be a pyroclastic material

A

pahoehoe

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10
Q

as the temperature of lava increases…

A

viscosity decreases

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11
Q

what type of volcano is relatively small, short-lived, and has steep sides?

A

cinder cone

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12
Q

what is the name for the material ejected during a volcanic eruption

A

pyroclastic

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13
Q

what is viscosity

A

a substance’s resistance to flow

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14
Q

what type of volcanoes are most common in the Ring of Fire

A

composite cone

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15
Q

the broad, slightly dome-shaped volcanoes of Hawaii are…

A

shield volcano

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16
Q

a volcanic bomb is a…

A

piece of semi-molten rock ejected as glowing lava

17
Q

a volcano that is fairly symmetrical and has both layers of lava a pyroclastic deposits is a

A

composite cone volcano

18
Q

what forms when magma hardens in the pipe of a volcano

A

volcanic neck

19
Q

what is a lahar

A

water-soaked ash and rock sliding downhill

20
Q

what forms when the top portion of a volcano collapses after an eruption

A

caldera

21
Q

what provides the force that causes magma to erupt to the surface

A

dissolved gases trapped in magma

22
Q

an explosive eruption occurs if magma is…

A

high viscosity

23
Q

a ____ ____ volcano only erupts once in its lifetime

A

cinder cone

24
Q

energy released during an earthquake travels in ___ ____

A

seismic waves

25
Q

the point within Earth where an earthquake starts is called the ____

A

focus

26
Q

volcanoes that occue closer to the middle of a plate away from plate boundaries are called ______

A

hotspots

27
Q

magma travels fro the chamber to the crater in a long tube called the ____

A

condiut

28
Q

large broad volcanoes with runny lava are classified as ____ volcanoes

A

shield

29
Q

this type of wave, called _______, are the fastest types of wave and the first to be detected

A

p-waves

Earth Science (3 decks)

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