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The Times

Giant glaciers pulverised Earth’s ancient rocks, setting the stage for complex life

  • Written by Chris Kirkland, Professor of Geochronology, Curtin University
Giant glaciers pulverised Earth’s ancient rocks, setting the stage for complex lifePetr Jan Juracka / Shutterstock

Imagine floating in space, gazing on a frozen white orb. The ball hangs in the void, lonely and gleaming in the light from its star. From pole to equator, the sphere is covered in a thick crust of ice. In orbit around the white planet is a single cratered moon.

You are gazing on Earth in the Cryogenian period, 700...

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