The material in the interiors of Jupiter and Saturn thought to be responsible for their powerful magnetic fields is:

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Quizplus · Accepted Answer

Both Jupiter and Saturn have strong magnetic fields that are thought to be generated by a dynamo effect in their interiors. It is believed that the material responsible for this effect is liquid metallic hydrogen, which behaves as a conductor under the extreme pressure and temperature conditions found deep inside these planets. Molten iron and nickel are common materials associated with Earth's magnetic field, but they are not believed to play a major role in the magnetic fields of Jupiter and Saturn. Gases of ammonia, methane, and water vapor are present in the atmospheres of these planets but are not the primary source of their magnetic fields. Solid magnetic iron is also not a likely candidate for the material responsible for these fields as it is not believed to exist in significant quantities at the depths where the dynamo effect occurs.

The Material in the Interiors of Jupiter and Saturn Thought