Long-term climate change

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1) Ice cores 

  • Scientists drill deep into the ice sheets to extract cores. Ice sheets are made up of lots of layers and new one every year. 
  • They can analayse gases in the ice and see when they formed, to see what the temperature was. They can see how the gases have varied.

2) Pollen Analysis. 

  • Preserved in sediment 
  • Pollen can be identified and dated to see when it was…


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