Science

Freshwater first appeared on Earth 4 billion years ago, ancient crystals hint

Oxygen ratios in ancient zircon crystals suggest that the planet’s water cycle got started hundreds of millions of years earlier than thought.

Jun 3, 2024 - 20:30
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Freshwater first appeared on Earth 4 billion years ago, ancient crystals hint
Oxygen ratios in ancient zircon crystals suggest that the planet’s water cycle got started hundreds of millions of years earlier than thought.

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