Please watch the documentary on YouTube using the link below and answer the following questions:
In the Path of a Killer Volcano: Mt. Pinatubo – YouTube
- Every year, about how many volcanic eruptions happen worldwide?
- What were the first signs of volcanic activity at Mt. Pinatubo?
- How many people would be affected by a large eruption at Mt. Pinatubo?
- What are the possible causes of the initial activity at Mt. Pinatubo?
- What volcanic gas do scientists look for when magma is rising beneath a volcano?
- Which possible volcanic hazards could they expect if Pinatubo erupted?
- What seismological event signaled scientists that this may be a “precursor to a historic event”?
- Why might scientists hesitate to evacuate an area around a volcano when there is a possibility of a large eruption? Please cite one example of an incident in the USA.
- What feature did scientists see that indicated there was very explosive magma just beneath the surface of the volcano?
- How many people were evacuated once the warning level was raised to 4?
- What did Mt. Pinatubo do during the first “throat-clearing” part of the eruption?
- How much time passed from wondering whether the volcano was “waking up” to when it actually erupted on 15 June?
- What volcanic hazards existed during the main eruption?
- From what distance away from the volcano were people evacuated?
- What damage resulted from the eruption of Mt. Pinatubo?
- How did the size of the Mt. Pinatubo eruption compare to the Mt. St. Helens eruption?
- What volcanic hazards exists well after the eruption ended in 1991?
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