Most geophysicists have long assumed that a 2,200-kilometer-thick layer of molten iron swirling deep inside the core creates the planet's self-sustaining field.
Most geophysicists have long assumed that a 2,200-kilometer-thick layer of molten iron swirling deep inside the core creates the planet's self-sustaining field.
长久以来，大多的地球物理学者都假设有一层2200公里厚的熔融铁层在外地核流动，地球的独立磁场于焉产生。