a$)$ Do you notice a trend in the data measured over the various years? Explain.

b$)$ If so$,$ what do you think is the possible cause?

c$)$ The height of flags # $1-17$ seems to be rather flat. Starting from flag # $18,$ the height seems to increase. Can you think of a reason for that?

$[$Hint: refer to the map on page $9$ to answer this question$]$

Conclusions

Please summarize in a short sentence what you learned from this Case Study.