Is there any water involved?

Does anybody know whether or not there is water involved in this shrinking process? If this SHOULD be the case, shrinking sure hasn't to do with the expanding phase change liquid-solid. However, it might be the phase change gaseous-liquid.

Not that I know of, the sources did not indicate that this may be the case. The sources indicated that the contraction could be caused by the cooling of the inner core of the Moon.

i.e. the contraction of solid phases. Thank you. :-)

there is water on the moon