An earth races prime stat is always higher than it's recessive stat.
Dwarves are the shapers of the earth, that work the earth and give it's power purpose. Traditional enemies of orcs.
Prime: PE
Recessive: PA
Halflings are the earths friends. They enjoy and appreciate it's richness. Traditional enemies of trolls.
Prime: PA
Recessive: PS
Gnomes are the caretakers of the earth and have a strong connection with it. Traditional enemies of giants.
Prime: MA
Recessive: PS