Ice cores have helped scientists assemble a climate record stretching back more than 400,000 years.
(a climate record; stretching; back; T:more than 400,000 years) (Ice cores; have helped; scientists assemble a climate record) Context(Ice cores have helped,List([0, 21))):(scientists; assemble; a climate record stretching back more than 400,000 years)
Ice cores have helped,List([0, 21))
a climate record Ice cores scientists
stretching have helped assemble
back T:more than 400,000 years
scientists assemble a climate record
a climate record stretching back more than 400,000 years