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Buried deep within glaciers and polar ice sheets lie ancient time capsules—ice cores that preserve thousands of years of Earth’s climate history. Here’s how scientists decode them:
Layers of time: Each ice layer = 1 year, like tree rings. The oldest ice cores go back 800,000 years!
Trapped bubbles: Tiny air pockets reveal past CO2 levels and atmospheric composition.
Volcanic ash & pollutants:
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