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     EduGorilla 
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    According to the passage, which of the following was crucial to the discovery of magnetic reversal?

    Options :-

    1. The rapid change from "normal" to "reversal" polarity
    2. Lava flows 'pointing' to magnetic north
    3. Solidification of rocks formed from magmas
    4. The extinction of certain species 700,000 years ago
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