Explain the ratio of oxygen isotopes

Reference no: EM13250869

Ice cores are drilled and removed from the glaciers of Antartica. The ratio of oxygen (Oxygen-16 and Oxygen-18) isotopes is measured and used to determine the approximate temperature during the time that part of the ice core was formed. This method is one example of a proxy. In a few sentences, explain what a proxy is and why it is necessary research like this.

Reference no: EM13250869

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