Is the reason that Earth has such a large magnetic field due to its swirling iron core? Is the iron core of Earth swirling so much because of the (large) moon? -
![Nature Reviews Earth & Environment 🌈 on Twitter: "Earth's magnetic field is generated by fluid motions (geodynamo) in the outer core, which has operated for >3.4 Ga 🌍 Maylis Landeau et al. Nature Reviews Earth & Environment 🌈 on Twitter: "Earth's magnetic field is generated by fluid motions (geodynamo) in the outer core, which has operated for >3.4 Ga 🌍 Maylis Landeau et al.](https://pbs.twimg.com/media/FOXY8TFWYAASdzD.png)
Nature Reviews Earth & Environment 🌈 on Twitter: "Earth's magnetic field is generated by fluid motions (geodynamo) in the outer core, which has operated for >3.4 Ga 🌍 Maylis Landeau et al.
![earth with no magnetic field | ... fields venus has a mainly iron core like earth but no magnetic field | Magnetic field, Earth's magnetic field, Outer core earth with no magnetic field | ... fields venus has a mainly iron core like earth but no magnetic field | Magnetic field, Earth's magnetic field, Outer core](https://i.pinimg.com/564x/e4/19/2a/e4192ac019e7b6ddbf46f8dad3c22d75--king-james-pigeon.jpg)