Comment on 4.4 billion-year-old crystal is oldest confirmed piece of EarthparentComments−s0rce12yIt solidified from the melt 4.4 billion years ago and hasn't remelted since.−Sharlin12yOr otherwise changed. Metamorphism doesn't involve melting.
Comments
It solidified from the melt 4.4 billion years ago and hasn't remelted since.
Or otherwise changed. Metamorphism doesn't involve melting.