Provenance
Research on comparisons between Venus and the Archaean Earth was undertaken in collaboration with Jean Bédard (GSC, Quebec, Canada). Venus gravity and radar data were provided by NASA, the USGS Astrogeology Science Center, and the Jet Propulsion Laboratory (JPL) at the California Institute of Technology. P. James (MIT) kindly supplied his crustal thickness data, calculated from NASA gravity and presented in James et al. (2013). S.-J. Chang is thanked for providing her seismic velocity data and MEAN velocity model from which seismic tomography figures were generated. Some features in the 3D 'cartoon' were modified after symbols courtesy of the Integration and Application Network, University
of Maryland Center for Environmental Science (ian.umces.edu/symbols/).

James, P. B., Zuber, M.T. & Phillips, R. J. 2013. Crustal
thickness and support of topography on Venus. Journal
of Geophysical Research: Planets, 118, 859–875,
http://dx.doi.org/10.1029/2012JE004237

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