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Cores are drilled with hand augers (for shallow holes) or powered drills; they can reach depths of over two miles (3.2 km), and contain ice up to 800,000 years old.

The physical properties of the ice and of material trapped in it can be used to reconstruct the climate over the age range of the core.

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Your self-esteem reflects the core beliefs you have about yourself.

The proportions of different oxygen and hydrogen isotopes provide information about ancient temperatures, and the air trapped in tiny bubbles can be analysed to determine the level of atmospheric gases such as carbon dioxide.

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    'Our research offers a long-term context to better understand these changes.'The results from the study tell scientists how the climate of the North Atlantic region, which includes the U. The scientists are continuing their cave study, working to extend the record back 13,000 years or more.

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