Lunar Update

The web site Space.com also presents a new theory proposed that most of the Moon may not have been formed from a single giant impact/ejection on the early Earth but multiple impact/ejections that coalesced into a single satellite.

In order for a moon to enlarge, there would have to be a time period where the net sizes of the impacting rocks were sufficiently small enough, and travelling relatively slow enough, to avoid shattering the larger conglomerate-mass back into smaller fragments.

Judging from the moons' numerous surface craters, there was plenty of space debris left to build up (additional layers) of moon mass for quite a while, to allow it to become big enough to absorb bigger collisions, without shattering.

It appears that the rate of accretion was slow enough to avoid enough heat accumulation to foster volcanic eruptions on what would become the moon, but fast enough to do so on what would become the earth.

Whether earth volcanoes would ever be powerful enough to eject particulate material high enough to then become attracted by the still-forming moon seems problematic...