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JDepinet t1_iu42sh5 wrote

Reply to comment by DrFlukey in Magma on Mars Likely - Until now, Mars has been generally considered a geologically dead planet. An international team of researchers led by ETH Zurich now reports that seismic signals indicate volcanism still plays an active role in shaping the Martian surface. by GeoGeoGeoGeo

The core needs to have a solid inner and molten outer to form a magnetic field.

It could easily have a totally solid core, and still have a mostly molten mantle and volcsnism.

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