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As we see in the news this week (20 Aug 2010) the Moon _does_ have lobate scarps. So we only need to deal with Earth.

The theory is that the scarps are created due to contraction due to cooling of the interior of the body.

Our tectonically active planet has plates that are in constant motion. Most of this is believed to be driven by convection of the molten core, but with movable plates, any contraction is easily accommodated by the same mechanism.

Earth's system of tectonic plates lets it handle the contraction from cooling, or the convection driven motion of the plates in a way that generates our own analog of lobate scarps. Where a plate subducts (think South America's west coast) a 'scarp', in this case the Andes mountains, is pushed up adjacent to it.

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Q: Why do neither Earth nor Earth's moon have lobate scarps like the ones observed on Mercury?
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