Volcano Key Terms

Question 1

Active volcano

Answer 1

Erupted in the last 100 years

Question 2

Dormant volcano

Answer 2

Erupted in the last 100-150 years

Question 3

Extinct volcano

Answer 3

Erupted over 1000 years ago

Question 4

Vent

Answer 4

Opening through which lava flows from a volcano

Question 5

Magma

Answer 5

Molten rock from deep within the earth.

Question 6

Lava

Answer 6

Molten magma when it erupts at the surface

Question 7

Crater

Answer 7

The hollow at the mouth of a volcano

Question 8

Pyroclastic flow

Answer 8

It is an avalanche of gas ash and rocks that rush down the slopes of a volcano after an explosive eruption

Question 9

Lahar(mud flow)

Answer 9

Water mixed with volcanic ash running down a volcano.

Question 10

Composite volcanoes are…

Answer 10

Very high/have a narrow base
Contains sticky magma with silica in it
Are very explosive as more pressure builds up under the sticky magma
Lava doesn’t flow far when the volcano erupts
When the lava hardens it forms the steep sided shape of a composite volcano.
Found at destructive plate boundaries

Question 11

Shield volcanoes are

Answer 11

Have gently sloping sides/wide base
Contain more runny lava with less silica in it
Erupt more gently
When it erupts the lava flows out quickly.
The lava spreads out an hardens to make the gentle slope of a shield volcano.
Found at constructive plate boundaries