Geologist would use ice-core samples, rocks, and mud layers to find evidence of contaminates like radiation, chlorine, mercury, and coal exhaust.
Ice cores are ice cylinders that have been extracted from glaciers and ice sheets. They effectively serve as frozen time capsules that enable researchers to recreate former climates and the changes. Ice core layers are arranged according to years and seasons, with the newest ice at the top and the oldest at the bottom.
Geologist collects the ice cores all over the planet to research regional climate variability and to compare and contrast that variability with signals from the global climate. Ice cores, or samples taken from the ice, provide a history of our planet hundreds of thousands of years ago.
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