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In Russia's Extreme North,
a widening chasm
known as the Batagaika Crater
provides a unique opportunity
to study the past.
Early declassified aerial images
recorded the crater's growth
in the 1960s and 1970s
followed by multispectral sensor imagery
captured by Landsat and
Sentinel satellites,
building a continuous view over
the last 60 years.
But the gash in the ground
offers an opportunity
to study much further back
in time.
Each exposed layer of
the crater wall
is like a geological snapshot,
helping scientists understand
the past climate of the permafrost.
The layers at the bottom could be
as old as 650,000 years.
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