In the Earth/Moon binary planet system, the Moon is systematically low in volatiles compared to the Earth, and lunar rocks have been found to be almost completely water free.
(the Moon; is; systematically low; L:in volatiles; L:In the Earth/Moon binary planet system) (lunar rocks; have been found; ) (lunar rocks; to be; almost completely water free)
the Moon lunar rocks lunar rocks
is have been found to be
systematically low L:in volatiles L:In the Earth/Moon binary planet system
almost completely water free