Volcanic Hazards

Question 1

What is the difference between magma and lava?

Answer 1

Magma is underground.

Lava is above ground.

Question 2

Where are low silica, basaltic lava volcanoes found?

Answer 2

Constructive plate boundaries.

Question 3

What is the nature of low silica, basaltic lava volcanoes?

Answer 3

Non - explosive (low magnitude)

Question 4

What is the frequency of low silica, basaltic lava volcanoes?

Answer 4

High frequency - more runny

Question 5

Where is high silica, Rhyolitic lava volcanoes found?

Answer 5

Destructive plate boundaries.

Question 6

What is the nature of high silica, Rhyolitic lava volcanoes?

Answer 6

Explosive (high frequency)

Question 7

What is the frequency of high silica, Rhyolitic lava volcanoes?

Answer 7

Low frequency - thicker, builds up.

Question 8

What is the Volcanic Explosive Index (VEI)?

Answer 8

0-8, 0=non-explosive, 8=mega - explosive.

Logarithmic scales - each single digit step = a tenfold increase in eject volume