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Radioactive elements, either of natural origin or created by nuclear testing, can be used to date the layers of ice in the cores.

Some volcanic events which were sufficiently powerful to have distributed material around the globe leave a signature in the ice which can be detected in many different cores, allowing synchronization of the time scales between two different locations.

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The ratio of oxygen and hydrogen isotopes in the ice provides information about ancient temperatures; and the air trapped in tiny bubbles in the ice can be analyzed to determine the level of atmospheric gases such as carbon dioxide.

Since heat flow in a large ice sheet is very slow, the borehole temperature is another indicator of temperature in the past, and these sources of information can be combined to find the climate model that best fits all the available data.

Cores are recovered by drilling with hand augers (for shallow holes) or powered drills; the deepest cores recovered reach depths of over two miles, and can contain ice up to 800,000 years old.

Both the physical properties of the ice itself and material trapped in the ice can be used to reconstruct information about climate over the age range of the core.

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