According to the charge-neutrality principle, the electric charge of the whole Earth is ZERO. ... It probably because at the inner core of the Earth, the temperature and pressure is so high that the atoms there are ionized. So the inner part of earth is posstively charged. Therefore, its surface is negatively charged.
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Explanation:
According to the charge-neutrality principle, the electric charge of the whole Earth is ZERO. ... It probably because at the inner core of the Earth, the temperature and pressure is so high that the atoms there are ionized. So the inner part of earth is posstively charged. Therefore, its surface is negatively charged.