Ma" means"millions of years ago" 'M' for"Mega-" So where we are right now, the Moon has formed,
and we're in what we call the Hadean period or actually I shouldn't say"period.
We don't have any kind of macroscopic-scale rocks from the Hadean period, and that's because at that time,
we believe, the Earth was just this molten ball of kind of magma and lava, and it was molten because it was a product of all of these accretion events and all of these collisions and all this kinetic energy turning into heat.