Cercetătorii de la Universitatea Leeds din Marea Britanie spun că această particularitate reprezintă de fapt o reacţie a planetei noastre la acţiunea câmpului geomagnetic. Nucleul intern solid se află la 5200 de km adâncime şi este de mărimea Lunii. El este înconjurat de lichidul din nucleul extern, alcătuit dintr-un aliaj de fier, a cărui mişcare generează câmpul magnetic.
„Câmpul magnetic împinge nucleul intern spre est, făcându-l să se învârtă mai repede decât Terra, dar el împinge în direcţia opusă şi lichidul din nucleul extern, fapt care generează mişcarea spre vest a acestuia”, a explicat profesorul Philip Livermore de la School of Earth and Environment din cadrul Universităţii Leeds
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