Scientists can analyze the ice in the ice cores, and the sediments in sea-floor sediments, to see how the relative amounts of these two oxygen isotopes have changed over time.
(Scientists; can analyze; the ice in the ice cores) (the sediments in sea-floor sediments; to see; how the relative amounts of these two oxygen isotopes have changed over time) Context(the sediments in sea - floor sediments to see,List([53, 97))):(the relative amounts of these two oxygen isotopes; have changed; T:over time)
the sediments in sea - floor sediments to see,List([53, 97))
Scientists the sediments in sea-floor sediments the relative amounts of these two oxygen isotopes
can analyze to see have changed
the ice in the ice cores
how the relative amounts of these two oxygen isotopes have changed over time
T:over time