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deondra12 said: It is the right distance from the sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atomsphere, and it has the right chemical ingredients for life, including water and carbon.
Answer: "cluster" .
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That is much less often than in the last 150 million years, when the field has flipped every 600,000 years. In the last 10-20 million years it has sped up even more, to once every 200,000-250,000 years. "The evidence points to a more stable field in the very far past and fewer reversals," says Veikkolainen.
I think they all identify climate regions.<span />
