Ice cores are drilled in long cylinder lengths like the one above.
This diagram shows the variation in the ice core and the bubbles in the ice made up of greenhouse glasses which can be related back to climate in the atmosphere of that particular historic time period.
The ice cores are sliced into sections to get a better determination of whats in the ice core.
These sections are generally the ones containing 'frozen' atmospheric particles of greenhouse gases which can be melted down on special laboratory equipment determining the amount of carbon dioxide or methane that was in the air in that time period/zone.
The ice cores are all carefully labeled and stored for further research and information.
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