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Question:Which of the methods listed below wouldbe MOSTeffective for monitoring and early detection of a lateral blast?

Question:Which of the methods listed below would be MOST effective for monitoring and early detection of a lateral blast? 

Hint: read and think carefully about these choices!

Select one:

a. GPS receivers to detect growth of the volcano

b. 

c. Tiltmeters recording deformation of the volcano surface

d. 

e. Analyzing patterns of earthquakes occurring deep in the magma chamber 

Which of the following hazards took the longest to reach residents living below the Mt. St. Helens volcano?

Select one:

a. earthquake 

b. 

c. lahar

d. pyroclastic flow 

e. turbulent surge

Based on the outcome of that eruption, what is the likely demise of big Mt. St. Helens crater?

Select one:

a. a slow eruption of sticky lava that infills the crater

b. a slow eruption of lava that piles volcanic rock onto the flank of the volcano

c. infilling of the crater by ejected pumice lapilli 

d. slow growth of the crater by collapse of the floor

e. infilling of the crater by a runny lava that builds a lake

Consider the topographic map of Mt Rainier below... also available in full size on the main iLearn page. It shows a birds eye view of the top of the volcano, it's slopes, rivers that travel down the volcano, and the valleys below.

Where on this volcano do you expect the lahars to form?

Select one:

a. In the river valleys 

b. 

c.At the head of the glaciers

d. On the volcano slopes

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