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Implications of a long-lived basal magma ocean in generating Earth's ancient magnetic field
Impact: The hypothesized existence of a basal magma ocean, a liquid rather than solid core for the ancient Earth, and new views of the insulating capabilities of the mantle, imply that the mechanism for generating Earth's magnetic field has changed over time. This also suggests there may have been transitional periods during which the Earth's magnetic shield was absent or reduced.

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