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15. What type of volcanic eruption is shown in this photograph?<br />
a) a lava fountain<br />
b) collapse of a volcanic dome<br />
c) a fissure eruption<br />
d) a pyroclastic column<br />
e) a volcanic mudflow<br />
16. In which of the following environments is the lithosphere likely to be thinnest?<br />
a) beneath a major mountain range<br />
b) beneath a mid-ocean ridge<br />
c) beneath a typical part of the abyssal plain<br />
d) a tectonically active continental margin<br />
e) the interior of a continent away from plate boundaries<br />
17. The diagram on the right shows the record of one<br />
earthquake on seismograms at three different<br />
stations in a seismic network. These three<br />
seismograms show:<br />
a) ISCO station is closest to the earthquake<br />
b) WUAZ station was right at the earthquake<br />
c) DUG station is farthest from the earthquake<br />
d) WUAZ is the closest station, followed by DUG, and<br />
then ISCO<br />
e) none of these<br />
18. Which of the following volcanoes is generally the largest?<br />
a) scoria cone<br />
b) dome<br />
c) sulfur volcano<br />
d) composite volcano<br />
e) shield volcano
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