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Nuclear power plants and nuclear weapons can produce iron-60 but there was no global fallout to justify the excess of iron-60 seen in the sample from Antarctica.
They suspect this rare element arrived in Antarctica in the form of interstellar dust, and it arrived in the last 20 years.
This radioactive element can be produced in certain nuclear processes and in supernovae.
Eruptions from a central 400 m (1,300 foot) wide crater have constructed the cone’s steep (33°) outer slopes.
Mt Ngauruhoe is thought to have been active for at least 2,500 years, with more than 70 eruptive periods since 1839, when European settlers first recorded a steam eruption.
We know the true ages of the rocks because they were observed to form less than 50 years ago.