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geography > voclanos > Flashcards

voclanos Flashcards

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1
Q

what is a volcano

A

an opening of the earths crust where molten lava and gas erupts

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2
Q

what is a dormant volcano

A

a volcano that has not erupted for a very long time but might erupt one day

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3
Q

what is a shield volcano

A

a broad domed volcano with gently sloping sides that has many layers

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4
Q

what is a composite volcano?

A

a large steep volcano composed of lava flows that produce layers of tephra found mostly when earths surface subducts

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5
Q

what is a caldera

A

The large hole at the top of a volcano formed when the roof of a volcano’s magma chamber collapse

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6
Q

what is a ring of fire

A
  • a major belt of volcanos that go around the Pacific Ocean
  • 75% of volcano are here
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7
Q

what is the main vent

A

the tunnel in witch magma rises

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8
Q

what is the crater

A

opening at the top of a volcano

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9
Q

what is pyroclastic flow

A

a rapid flow of poisonous material from a volcano

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10
Q

what is magma

A

molten rock below the earths surface

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11
Q

what is lava

A

molten rock on the earths surface

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12
Q

what plate margins are composite volcanos found on

A

destructive plate margins

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13
Q

what plate margins are shield volcanos found on

A

constructive plate margins

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14
Q

what is a magma chamber

A

a place beneath the vent where molten rock is stored before the eruption

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15
Q

what is a volcano cloud

A

Gas, steam and ash escaping from volcano

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16
Q

what is a volcano bomb

A

Large pieces of rock ejected from the volcano

17
Q

What can the temperature of lava range from

A

700-1200 c

18
Q

What are primary effects of a volcano

A
  • lava flow can cause damage to habitats and property
  • pryoclastic flow can cause damage as it is heated gas and ash
  • ash from volcanoes can land on roofs of building causing them to collapse
19
Q

What are secondary effects of a volcano

A
  • volcanic eruptions can lead to climate change
  • carbon dioxide released can contribute to global warming
  • mod of transports could be blocked of from public use

geography (9 decks)

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