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Earth’s mountains may have mysteriously stopped growing for a billion years Starting about 1.8 billion years ago, the planet s continental crust thinned, slowing the flow of nutrients into the sea and possibly stalling the evolution of life. ByMaya Wei-Haas Email If you could explore Earth’s surface a billion years ago, the most remarkable sight might be the world’s un-remarkability. There would be no trees or bugs, nor birds overhead. The only life is simple and small, a slimy oceanic soup. Science points to yet another feature that may be missing: towering mountains. The restless tectonic plates of modern Earth shift continuously, in a slow-motion dance that reshapes the surface of our planet. Collisions between continents thicken the crust and heave up mountains, such as the Himalayas, that reach ever higher into the skies.

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