Two markers have been placed on the graph. One marks the
peak of a strong warming trend at 133,000 years ago, and the
other marks the minimum temperature reached at the end of
a cooling trend 64,000 years ago. Carefully examine the graph
and identify a peak that marks the end of another strong warming
trend and a dip marking the end of another strong cooling
period.
! Drag
the arrows from the tool palette onto the graph to mark these
two points. Use another piece of paper to record the ages
of all four marked points.
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