Complex sentence: For the Earth\\ mathrm --\\ mathrm is estimated to be in the range 10 3 to 10 4, dissipation more is significant, but a magnetic field is supported by motion in the liquid iron outer core.
Split into simpler sentences: For the Earth,\\ mathrm --\\ mathrm is estimated to be of order 10 3. Dissipation more is significant, but a magnetic field is supported by motion in the liquid iron outer core.