Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Inverted relief is a landscape that is part of a planet's surface, e.g. Mars, that contains positive landforms, i.e. hills and ridges, that were once depressions in its surface. On Earth, inversion of relief can occur whenever either the sediments or other strata underlying a depression, typically the floor of a floodplain or fluvial valley, becomes more resistant to erosion than the strata in which the valley has been cut. Then differential erosion preferentially removes the less resistant strata underlying the walls of the depressions and adjacent uplands, leaving the floor of the depression as a topographic high.
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