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News and Views
Nature 449, 294-296 (20 September 2007) | doi:10.1038/449294a; Published online 19 September 2007
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Geochemistry: Earth holds its breath
Chris J. Ballentine1
Abstract
Some inert-gas isotopes in Earth's atmosphere can only have come from deep inside the planet. We thought we knew how much gas Earth gives up, and how it does it — but a challenge has emerged to the prevailing model.
Slowly, Earth is cooling. The culprit is solid convection, which transports hot, buoyant material to Earth's surface from as far down as the core–mantle boundary, 2,900 kilometres beneath us.
- Chris J. Ballentine is at the School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK. Email: chris.ballentine@manchester.ac.uk
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