Mt St Helens

Question 1

List the secondary effects of the eruption

Answer 1

Ash blocked rivers destroying popular fishing sites and causing flooding. This in turn destroyed crops and livestock.

Flooding destroyed communications such as road and railway bridges.

Sediment carried downstream ruined barge transport on the Columbia river.

Question 2

List the short term responses and results

Answer 2

Communications such as road and bridges were repaired.

People were rehoused

Question 3

Long term responses and results

Answer 3

Soil fertility improved due to the ash deposits

The volcano is now more carefully monitored

Tourism has increased, boosting the local economy.

Question 4

List the primary effects of the eruptions

Answer 4

Hot ash and gas destroyed forests and logging camps

63 people were killed mainly by poisonous gases

Lahars(mudflows of ash and water) covered an extensive area surrounding the volcano