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1.2 billion-year-old groundwater is some of the oldest on Earth

Groundwater recently discovered deep underground in a mine in South Africa is estimated to be 1.2 billion years old. Researchers suspect that the groundwater is some of the oldest on the planet. Its chemical interactions with the surrounding rock could offer new insights about energy production and storage in Earth’s crust.

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https://www.livescience.com/ancient-groundwater-mine-south-africa

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