The Earth's magnetic field is generated as the molten iron of the Earth'soutercore revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created.
地球磁场是由地球外核的熔铁围绕固体内核旋转而产生的；当铁水激增，就会发生磁暴。
2
The explanation may be in Earth's mantle, the layer of rock underlying the tectonic plates and extending down over 1,800 miles to the outer edge of Earth's iron core.
解释可能是在地球的地幔中，这是在构造板块下面的岩石层，向下延伸超过1800英里到地球铁芯的外边缘。
3
The innermost region of the Earth'soutercore periodically flows faster or slower, and this action "tugs" at the planet's magnetic field, says Gillet.