Volcanoes

Question 0

Volcanic activity can be intrusive and extrusive. What does this mean?

Answer 0

Intrusive: below earths surface
Extrusive: on earths surface

Question 1

5 main types of volcano…

Answer 1

Dome
Composite cone
Shield
Caldera
Fissure

Question 2

Lava eruptions are extrusive, and the formation of large magma chambers (batholiths) is intrusive. Name other intrusive features…

Answer 2

Dyke
Sill
Batholith
Laccolith

Question 3

Lava eruptions are extrusive.

What are the 3 main types of lava?

Answer 3

Basaltic
Andesitic
Rhyolitic

Question 4

At which plate margin would you find basaltic lava?

Answer 4

Constructive

Question 5

At which plate margin would you find andesitic lava?

Answer 5

Destructive

Question 6

At which plate margin would you find rhyolitic lava?

Answer 6

Destructive

Question 7

What is the silica content of the 3 lava types (low, medium and high)?

Answer 7

Basaltic: LOW
Andesitic: MEDIUM
Rhyolitic: HIGH

Question 8

Where do dome volcanoes occur?

Answer 8

At destructive margins

Question 9

Where do caldera volcanoes occur?

Answer 9

Destructive margins

Question 10

Where do shield volcanoes occur?

Answer 10

Constructive margins

Question 11

Where do fissure volcanoes occur?

Answer 11

Constructive margins

Question 12

What type of lava do dome volcanoes eject?

Answer 12

Rhyolitic or Andesitic

Question 13

What type of lava do caldera volcanoes eject?

Answer 13

Andesitic or rhyolitic

Question 14

What type of lava do shield volcanoes eject?

Answer 14

Basaltic

Question 15

What type of lava do fissure volcanoes eject?

Answer 15

Basaltic

Question 16

What are hot springs?

Answer 16

Springs are places where groundwater emerges at the surface of the crust. If these areas are close to recent intrusive volcanic activity, the water is heated, resulting in a HOT SPRING.

Question 17

Hot springs and geysers are NOT the same.

What is a geezer?

Answer 17

A cool dude in London.

Question 18

No seriously, what is a geyser?

Answer 18

Where the groundwater is heated to boiling point and ejected with more force due to increased pressure.

Question 19

What is a hotspot?

Answer 19

A volcano that occurs away from a plate margin.

Question 20

What causes a hotspot to occur?

Answer 20

Magma plume rises from mantle. This stays stationary and the ground above moves upwards over time. Over time this creates a dormant volcano, as the crust will continue to move over the hotspot, eventually creating a chain of dormant volcanoes.