original: however , unlike the moon , it has a large iron core , which generates a magnetic field about 1 % as strong as that of the earth .
simplifications: still , unlike the moon , it has a large iron core , which creates a magnetic field -lrb- a region around a magnetic material or a moving electric charge within which the force of magnetism acts -rrb- about 1 % as strong as that of the earth . unlike the moon , it has a large iron core , which generates a magnetic field about 1 % as strong as that of the earth . unlike the moon it has an iron core , which generates a magnetic field about 1 % the strength of the earth . however , unlike the moon , it has a large iron core , which creates a magnetic field about 1 % as strong as that of the earth . however , unlike the moon it has a large iron core which generates a magnetic field about 1 % as strong as that of the earth . however , unlike the moon , it has a large iron core , which creates a magnetic field about 1 % as strong as that of the earth . 1 . however , unlike the moon , it has a large iron core , which produces a magnetic field about 1 % as strong as that of the earth . but not like the moon , it has a big iron core , which makes a magnetic field about 1 % as strong as earth 's .