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Flashcards in Volcanoes Deck (12)
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1
Q

What’s a vent?

Secondary vent?

A

Vent- the pipe through which magma rises

Secondary vents - a smaller vent on side of volcano

2
Q

What’s a crater?

A

Bowl shaped depression at top of volcano

3
Q

What are fumaroles?

A

A pipe through which gases rise (eg:sulphur dioxide)

4
Q

What are volcanic bombs?

A

Chunks of molten lava thrown into air.

5
Q

Describe the distribution of volcanoes

A
  • unevenly spread throughout Southern and Northern hemisphere
  • they’re in lines and belts that sit on plate boundaries
  • at edges of Pacific Ocean there’s volcanoes close together in linear patterns
  • cluster of volcanoes in Iceland
6
Q

Name an anomaly of volcanic distribution

A

In Hawaii there’s a volcano that stands alone (not on plate boundary) due to lava flow underground. This is called a hotspot

7
Q

Where do volcanoes occur?

A

Constructive and destructive plate boundaries

8
Q

Name the three types of volcanoes

A

Composite volcanoes
Shield volcanoes
Done volcanoes

9
Q

What is a composite volcano?

A

Built up by many layers of hardened lava, pumice and volcanic ash. Have crater on top. They have steep sides and are tall with quiet eruptions. High velocity lava that hardens quickly before spreading. Form at DESTRUCTIVE BOUNDARIES.

10
Q

What’s a shield volcano?

A

A shield volcano is built of almost entirely lava flow. They’re wide and low-lying with gently sloping sides. They erupt highly fluid lava which travels further before it hardens. They form at CONSTRUCTIVE BOUNDARIES

11
Q

What are the main features of dome volcanoes?

A
  • very tall

- steep sides

12
Q

What’s a magma chamber?

A

Where magma is stored underground