How does ice retain a record of past atmospheric gas composition?       in trapped air bubbles     within the frozen water molecules     in air trapped at the bedrock-ice interface     indirectly through the composition of included volcanic ash layers     All of the answers are correct.

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How does ice retain a record of past atmospheric gas composition?

 

 

 

in trapped air bubbles

 

 

within the frozen water molecules

 

 

in air trapped at the bedrock-ice interface

 

 

indirectly through the composition of included volcanic ash layers

 

 

All of the answers are correct.

 
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