Long-Term Research Page 2


Now take a look at this graph, with data from the next six years (1970-1975).

  • What does the graph seem to indicate?

  • Does it appear that precipitation acidity is increasing or decreasing?

  • How does this compare with the previous graph?

  • Can you make any conclusions about HBEF long-term precipitation acidity trends based on these two graphs?

  • Do you think we have enough data from these 11 years to understand long-term precipitation acidity trends? Why or why not?

The next page contains all the precipitation pH data from the HBEF.

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