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Acasta gneis rock sample from north-west Canada.

Acasta gneis rock sample from north-west Canada.
4 0 c m
actual image size: 26cm x 32cm


This Acasta gneis is a sample of the oldest known rock in the world. It was found in north-west Canada and is approximately 4 billion years old, just 500 million years younger than the estimated age of the Earth. It is posible that this rock was formed when the very earliest life was appearing on Earth, and perhaps on Mars. Conditions on Earth and Mars are thought to have been similar at this time.

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© Science Museum / Science & Society Picture Library

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