Ice core contain air that was trapped by the ice ,the year the ice was formed and hence can tell us the composition of the atmosphere as a function of time
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The answer is true as scientists are able to find the composition of Greenhouse gases several 1000 years ago with the presence of those very same gases between ice sheets.
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The statement mentioned in the question that,ice core contain air that was trapped by the ice ,the year the ice was formed and hence can tell us the composition of the atmosphere as a function of time.
The statement is completely true.
Due to research works in the Arctic regions, scientists have discovered ice contained with the air which was trapped almost 1000 years ago.And this air still has the composition of the 1000 years ago, which helps us to study the atmospheric characteristics of the past time period.
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