With no explanation, label each line with "O", "event-disaster", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Originally
created
by
plate
tectonics
about
35
million
years
ago
and
subsequently
altered
by
volcanism
and
erosion
,
the
river
's
drainage
basin
was
significantly
modified
by
the
Missoula
Floods
at
the
end
of
the
most
recent
ice
age
.
Originally:O
created:O
by:O
plate:O
tectonics:O
about:O
35:O
million:O
years:O
ago:O
and:O
subsequently:O
altered:O
by:O
volcanism:O
and:O
erosion:O
,:O
the:O
river:O
's:O
drainage:O
basin:O
was:O
significantly:O
modified:O
by:O
the:O
Missoula:event-disaster
Floods:event-disaster
at:O
the:O
end:O
of:O
the:O
most:O
recent:O
ice:O
age:O
.:O