Examine the map and legend above showing the extent of the materials deposited as a result of the eruption of the Mount St Helens volcano and answer the following questions - Leaving Cert Geography - Question A - 2013
Question A
Examine the map and legend above showing the extent of the materials deposited as a result of the eruption of the Mount St Helens volcano and answer the following qu... show full transcript
Worked Solution & Example Answer:Examine the map and legend above showing the extent of the materials deposited as a result of the eruption of the Mount St Helens volcano and answer the following questions - Leaving Cert Geography - Question A - 2013
Step 1
What were the most extensive deposits as a result of the eruption?
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Answer
The most extensive deposits resulting from the eruption of Mount St Helens were the lateral blast deposits. These deposits were spread out over a wide area due to the explosive nature of the eruption.
Step 2
What was the direction of the pyroclastic flow deposits?
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Answer
The direction of the pyroclastic flow deposits was primarily towards the North West and North East, as indicated by the map.
Step 3
What distance did the pyroclastic flow deposits extend to?
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The pyroclastic flow deposits extended approximately 5 to 5.2 miles from the volcano.
Step 4
Name two examples of pyroclastic materials.
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Two examples of pyroclastic materials are ash and pumice. These materials are formed during explosive volcanic eruptions and can be ejected into the atmosphere.
Step 5
Explain briefly why some volcanoes erupt violently.
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Some volcanoes erupt violently due to the high viscosity of the magma, which leads to the buildup of pressure within the volcano. When the pressure exceeds the strength of the rocks containing it, explosive eruptions can occur. Additionally, the presence of volatile gases, like water vapor and carbon dioxide, contributes to the explosive potential.
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