Of the past 2.5 billion years,what % have been ice ages?

Name: Of the past 2.5 billion years,what % have been ice ages?
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Question

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Over the past 2.5 billion years, there have been at least five major ice ages. However, the majority of Earth's history has not been characterized by glaciation. While precise estimates vary, it is generally believed that less than a quarter of the past 2.5 billion years have been ice ages, making option B the best choice.

Of the Past 2