Extrusive Volcanic Landforms

Question 1

Extrusive vulcanicity involves two forms of lava

Answer 1

• basaltic lava

- andesitic and rhyolitic (acid)

Question 2

What are lava plateaux

Answer 2

• fissure eruptions
• flows are basaltic in nature so flow great distances
• generally flat and featureless

Question 3

Example of a lava plateaux

Answer 3

Antrim lava plateau in Northern Ireland

Question 4

What else is included

Answer 4

Shield volcanoes
Some volcanoes
Composite cones
Calderas

Question 5

Ash and cinder cones

Answer 5

Formed from ash, finders and volcanic bombs ejected from the crater.
The sides are steep and symmetrical, e.g. Paricutin, Mexico