Question

the earth's magnetic field originates by . group of answer choices a permanent field due to magnetized, iron-rich, mineral grains in the oceanic lithosphere a high temperature superconductor in the inner core a self-generating and self-reversing dynamo in the outer core results from self-induction of rising magmas in the asthenosphere

Answer 1

The earth's magnetic field arises from a self-generating and self-reversing dynamo in the outer core. So the correct option is c.

The dynamo effect: The Earth's magnetic field is created by the intricate movements of fluids (called convection) in the outer core of our planet. Outer core is in fact a veritable ocean of molten metal (specifically iron and nickel), found between the solid iron seed with a radius of 1,220 km and the underneath of the mantle with a radius of 3,500 km.

Convection is certainly solutal rather than thermal and intimately related to the growth of the inner core: solid iron-nickel being less affluent in elements dissolved than the liquid, the crystallization of this liquid enhances the base of the outer core in dissolved elements.

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