With no explanation, label each line with "location-GPE", "O", "event-disaster", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
exact
causes
of
the
disappearance
of
the
Norse
settlements
toward
the
end
of
the
15th
century
remain
unverified
,
but
probably
resulted
from
a
combination
of
the
Little
Ice
Age
's
cooling
temperatures
,
soil
erosion
,
abandonment
by
Norway
after
the
Black
Plague
and
political
turmoils
,
more
convenient
ways
for
Europeans
to
procure
furs
and
a
mercantile
eclipsing
by
the
Hanseatic
League
,
and
competition
from
the
Inuit
moving
southward
.
The:O
exact:O
causes:O
of:O
the:O
disappearance:O
of:O
the:O
Norse:O
settlements:O
toward:O
the:O
end:O
of:O
the:O
15th:O
century:O
remain:O
unverified:O
,:O
but:O
probably:O
resulted:O
from:O
a:O
combination:O
of:O
the:O
Little:O
Ice:O
Age:O
's:O
cooling:O
temperatures:O
,:O
soil:O
erosion:O
,:O
abandonment:O
by:O
Norway:location-GPE
after:O
the:O
Black:event-disaster
Plague:event-disaster
and:O
political:O
turmoils:O
,:O
more:O
convenient:O
ways:O
for:O
Europeans:O
to:O
procure:O
furs:O
and:O
a:O
mercantile:O
eclipsing:O
by:O
the:O
Hanseatic:organization-other
League:organization-other
,:O
and:O
competition:O
from:O
the:O
Inuit:O
moving:O
southward:O
.:O