Volcanoes

Question 1

how is a volcano formed?

Answer 1

when magma reaches the surface and flows over the land as lava

Question 2

where are volcanoes found?

Answer 2

destructive boundary, constructive boundary and hot spots

Question 3

name the 2 types of volcanoes

Answer 3

explosive (destructive plate boundaries)

effusive (constructive plate boundaries and hot spots)

Question 4

what scale do you use to measure a volcano?

Answer 4

VEI (volcanic explosive index)
1-8

Question 5

how is the VEI calculated?

Answer 5

by the amount of material that is ejected by the volcano

Question 6

what type of lava would be found from an explosive volcano?

Answer 6

slow and thick lava

Question 7

what type of lava would be found from an effusive volcano?

Answer 7

very fast lava

Question 8

what are the volcanic impacts of explosive volcanoes?

Answer 8

• lava bombs
• pyroclastic flows
• lahar
• ash fall
• lava flow

Question 9

what are the volcanic impacts of effusive volcanoes?

Answer 9

• lava flow
• gas submissions
• ash falls

Question 9

what happens in an effusive volcano + hot spots?

Answer 9

the magma rises quickly to the surface
less pressure built up
free flowing lava

Question 10

what happens in an explosive volcano?

Answer 10

excess magma from subduction
as the magma rises it travels through the folded continental cast
it cools
more magma rises and pressure builds