Inside William's mind, sixteen ten-meter apple trees grew side by side, half of which were just over halfway to bearing fruit. Budding amongst the leaves of the other eight Element Farms were a hundred Element Fruits each, of the Earth, Sound, Blood, Blessing, Curse, Dream, Fate, and Karma Elements respectively.
William had spent almost a Billion Potential Points purchasing and upgrading the eight Farms to A-Rank, and he didn't choose any of these Elements randomly.
The Earth Element was a gimme, since if he could give it a Primary Law, it would be William's current second strongest Element after Fire. Not to mention its usefulness in completing the System Quest.