The earth’s magnetic field also protects us from harm. This shield originates deep inside the earth.
لَا شَكَّ أَنَّ مَدِينَةً كَهٰذِهِ سَتُصْبِحُ عَاجِلًا قَذِرَةً لِلْغَايَةِ وَيَتَعَذَّرُ ٱلْعَيْشُ فِيهَا .‏