By Michael Marshall
The emergence of familiar groups of animals was a result of the explosion of new species.
There is a dotted zebra.
The face of the planet changed 500 million years ago when animal life exploded in the oceans. The effects of that burst of evolution reached thousands of kilometres into Earth's heart.
A fundamental change in the deep Earth can be linked to a major event at the Earth's surface.
A huge range of animals evolved during the Cambrian explosion, which is thought to have begun about 541 million years ago. The emergence of arthropods, which include insects and spiders, was one of the highlights of the Cambrian explosion.
Giuliani and his colleagues say they have proof that the evolutionary blossoming had effects thousands of kilometres inside Earth.
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