Earth's Iron Core Depth (5,100 km)
Did You Know?
Verse 57:25, which mentions iron being 'sent down' from the heavens, is positioned at approximately verse 5,100 from the beginning of the Quran. This precisely matches the depth to Earth's outer core (5,100 km) where iron is concentrated. Scientists only discovered Earth's core structure in the 20th century through seismology.
And We sent down iron, wherein is great military might and benefits for the people
Quran 57:25
Explanation
The Quran's mention of iron being 'sent down' (anzalna) is positioned at verse 5,100 from the beginning, encoding the depth to Earth's iron-rich outer core at 5,100 km. This depth was only discovered through seismic wave analysis in the 20th century. The verse also confirms iron's cosmic origin - formed in supernovae and literally 'sent down' to Earth, a fact unknown until modern astrophysics.
Scientific Details
Earth's Internal Structure
Earth's outer core begins at approximately 2,890 km depth and the inner core at 5,100 km. The core is primarily composed of iron (85%) and nickel (10%), discovered through seismology starting with Inge Lehmann's work in 1936.
References
- USGS Earth Structure Data
- Seismological Research Letters