Glacier National Park has about 50 small glaciers, __ of
which are still large enough to be officially classified as
glaciers under ____ requirements.
Studies indicate that glacial retreat began about 1850
when there were more than 150 glaciers in Glacier NP.
These glaciers are direct remnants from an ice age that
ended about 11,000 years ago. Because of their relatively
low elevations and inland location, the park’s glaciers are
highly sensitive to ____.
37, U.S. Geological Survey, global climate change.