MDC Volcano (Mount St Helens, USA)

Question 1

Where

Answer 1

Mont St Helens- Cascade Range, Washington State, North-West America

Question 2

What plates

Answer 2

Joan de Fuca sinks under North American plate

Question 3

Why was it surprising

Answer 3

Dormant for 400 years

Question 4

Warning signs

Answer 4

Bulge appeared on North Face from blockage in Main Vent

Question 5

When

Answer 5

18th May 1980 0833 hours

Question 6

Behaviours

Answer 6

Blew of 390m from summit

Question 7

Primary effects

Answer 7

2 million gas mask ordered
Climate change
Tourists caught in mudflow

Question 8

When people thought it would erupt

Answer 8

Residents instructed to leave

No visitors within an 8km exclusion zone

Question 9

David Johnston quote

Answer 9

‘This is like standing next to a dynamite keg and the fuse is lit, but you don’t know how long the fuse is’

Question 10

Scale of volcano

Answer 10

Caused earthquake of 5.1 on Richter scale

Caused landslide on North-East side of mountain which was the biggest landslide ever recorded

Question 11

Sideways eruption

Answer 11

Blast of pulverised rock, glacier ice and ash wiped out all living things within 27km North of the crater

Question 12

Deaths

Answer 12

57

Question 13

Immediate reaction

Answer 13

Helicopters mobilised to search for injured

Question 14

Problems from ash

Answer 14

Planes grounded
Caused power outages
Clogged air conditioning
Blocked roads

Question 15

Ash cleared

Answer 15

Within 3 days (on the roads)

Question 16

Positive impact

Answer 16

Ash would improve fertility of the soil

Question 17

Within 10 years

Answer 17

Traces of vegetation

Insects birds and animals returned

Question 18

Money spent on transformation

Answer 18

$1.4 million

Question 19

Monument

Answer 19

National monument in 1982

Question 20

Visitors now

Answer 20

3 million each year

Question 21

Road to volcano

Answer 21

Reopened in 1990