There are several ice ages that has taken place here on earth. Recent studies of ice ages have interpreted glacial events by analyzing the oxygen isotope ratio in marine sediments.
This can also lead to the presence or expansion of continental and polar ice sheets and alpine glaciers.
The Earth's climate is said to often alternates inbetween ice ages and greenhouse periods. In this period, there will be no glaciers on the planet.
Scientists have recorded at least five important ice ages in the Earth's history.
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