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We report experimental results on the rift formation between two freezing waxplates. The plates were pulled apart with constant velocity, while floating onthe melt, in a way akin to the tectonic plates of the earth's crust. At slowspreading rates, a rift, initially perpendicular to the spreading direction,was found to be stable, while above a critical spreading rate a "spiky" riftwith fracture zones almost parallel to the spreading direction developed. Atyet higher spreading rates a second transition from the spiky rift to a zig-zagpattern occurred. In this regime the rift can be characterized by a singleangle which was found to be dependent on the spreading rate. We show that theoblique spreading angles agree with a simple geometrical model. The coarseningof the zig-zag pattern over time and the three-dimensional structure of thesolidified crust are also discussed.Comment: 4 pages, Postscript fil

Rifts in Spreading Wax Layers