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Trees grow faster and form wider rings in warm years and
grow more slowly and form narrower rings in cooler years.
The figure shows ring widths of a Siberian pine from 1500
to 2000.
(a) What is the range of the ring width function?
(b) What does the graph tend to say about the temperature of
the earth? Does the graph reflect the volcanic eruptions of
the mid-19th century?