Pratt studied the problem and came up with the idea of isostasy. Another hypothesis is the isostasy related to glaciations caused the uplift. This flow is reflected in phenomena such as isostasy, post-glacial rebound and mantle plumes. This results from the isostasy associated with orogeny (mountain formation). Her dissertation was titled "Continental and Oceanic Isostasy". Processes of isostasy involve the uplift of continental crusts along with their shorelines. The continental drift/ Airy-Heiskanen isostasy hypothesis had many flaws and scarce data. The warmth together with isostasy made it possible to inhabit the area around Kalix. One of these processes is due to magmatic underplating, while the other involves only isostasy. The geometry of the tilted block system can be greatly affected by subsidence and isostasy. In general, topography-controlled isostasy drives the short wavelength free-air gravity anomalies. Neither moon has a shape close to hydrostatic equilibrium; the deviations are maintained by isostasy.