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1. quizlet.com › 454181075 › astronomy-study-guide-from-chapter-9-flash-cardsastronomy study guide from chapter 9 Flashcards | Quizlet

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   20 ώρες πριν · Scientists suspect that Mars once had a global magnetic field. Assuming this is true, which of the following could explain why Mars today lacks a global magnetic field like that of Earth? Mars's interior has cooled so much that its molten core layer no longer undergoes convection.