Tropical glaciers in the Andes are at their smallest since the last major ice age, indicating extreme melting due to climate change.
Bedrock now exposed at glaciers in the Andes hasn't seen light for over 11,700 years, since the last major ice age ended.
Beryllium-10 and carbon-14 concentrations in exposed rock helped determine the last exposure, a method using long-lived isotopes formed by cosmic rays.
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