atmospheric carbon dioxide concentration changes radioactive decay rate changes in the outer core volcanic eruptions magnetic pole reversals
I gave my students this multiple choice question: Scientists use ice cores to identify and explain previous climatic trends. By correlating climatic conditions recorded in the ice, with solid, nonsnow particles also found in the ice, scientists can help to predict the climatic impact of which phenomena?

Only one answer is correct among these 4 choices:
- atmospheric carbon dioxide concentration changes
- radioactive decay rate changes in the outer core
- volcanic eruptions
- magnetic pole reversals

Could you tell me which one is correct?

volcanic eruptions