On 12/10/2022 at 1:29 AM, Moontanman said:

As the magnetic field of Mars was lost the Solar Wind would have swept the atmosphere of Mars away and slowly stripped away the ice by photo desiccation of the ice shell of Mars. This would have resulted in the surface being eroded by water while the ice shell was intact and as the ice shell was eroded and swept away the surface of Mars would have become the dessicated surface we see but with evidence of water flowing as well. Much like water flowing beneath a glacier on earth but on a much larger scale. 

How did Mars lose its magnetic field? Is it due to external changes or are there other possible reasons?

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10 hours ago, CrystalMagic said:

How did Mars lose its magnetic field? Is it due to external changes or are there other possible reasons?

Did it ?

Yes , it did . However , there are still pockets of REMNANT magnetism (basically permanent-magnets) embedded in the planet's crust .

These are relatively small , but some still have field-strengths well above that present at Earth’s surface .