Oldest Piece of Earth’s Crust Found

A piece of the Earth’s crust dated as 4.4 billion years old, has been discovered on a ranch in Jack Hills, Australia, just north of Perth. The zircon crystal, which only measures 400 micrometers long, is a translucent red that appears blue when bombarded with electrons. The dating of the crystal indicates that the Earth cooled much more rapidly than previously thought and may have had water at a much earlier age.

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