Mt. St. Helens

Question 0

The eruption was ……….. In the blast zone

Answer 0

600km2 north

Question 1

Which plates are being subducted?

Answer 1

Juan de Fuca under the North American

Question 2

How much ash covered how big an area in the eruption?

Answer 2

540m t of ash over 57,000km2

Question 3

Total cost

Answer 3

$1.1bn

Question 4

How many homes were destroyed?

Answer 4

200

Question 5

How many commercial flights closed?

Answer 5

1000

Question 6

How many bridges, roads and forest were destroyed?

Answer 6

27 bridges, 300km roads, 240km2 forest

Question 7

How many people and big game died?

Answer 7

57 and 7000

Question 8

What happened to Spirit Lake?

Answer 8

Sediment increased water level by 60m, dumping 12m young salmon

Question 9

Who was involved in the rescue?

Answer 9

FEMA and US Army

Question 10

How much ash did they clear

Answer 10

900,000 t

Question 11

How much land was replanted with how many trees?

Answer 11

45,500 acres with 18.4m trees

Question 12

What happened to the water?

Answer 12

It was monitored to check for contaminations

Question 13

Monitoring:

Answer 13

USGS knew of eruption= warning to evacuate 2000, but couldn’t locate side.