The top documents tagged [isotopes of lead pb]

Class 9 : The K-T impact (the Alvarez theory) Geological anomalies at K-T boundary. The K-T crater. Timeline for devastation.

Class 9 : The K-T impact (the Alvarez theory) Geological anomalies at K-T boundary. The K-T crater. Timeline for devastation.

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Class 9 : The K-T impact (the Alvarez theory)

Class 9 : The K-T impact (the Alvarez theory)

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