Mt St Helens Impacts

How much did the mountain lose in height due to the eruption?

• 400m

• 500m

• 300m

• 600m

What was the depth of the crater created at the top of the mountain?

• 500m

• 400m

• 600m

• 300m

Approximately how many salmon died due to the mudflow?

• 8 million

• 15 million

• 10 million

• 12 million

How far away were fully grown fir trees flattened?

• 30km

• 40km

• 25km

• 35km

What was the financial cost to farmers from the ash covering crops?

• More than £100 million

• Less than £100 million

• £150 million

• £50 million

What was the estimated volume of ash ejected during the eruption?

• 1 cubic kilometer

• 0.5 cubic kilometers

• 2 cubic kilometers

• 3 cubic kilometers

How long did the main eruption phase last?

• 9 hours

• 12 hours

• 6 hours

• 3 hours

What was the distance covered by the ash cloud from the eruption?

• 1000 km

• 800 km

• 1200 km

• 1500 km