The same water has been on Earth for four and a half billion years. Where did this water come from?
- 4.5 billion years ago, the Earth's surface was too hot for water to exist.
- Inside the Earth's core, oxygen and hydrogen had bonded to create masses of steam.
- Thousands of volcanoes erupted, emitting the steam into the atmosphere.
- The Earth cooled, causing thousands of years of rainfall - which provided half of the world's water.
Today, 70% of the Earth's surface is covered in water.
But in Earth's infancy, 4.5 billion years ago, there was no water here at all.
Earth was a molten inferno. It was too hot for liquid water to exist!
But inside the Earth's core, oxygen and hydrogen had bonded to create the gaseous …
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