Pratt's hypothesis of isostasy proposed that topography is produced by crustal blocks with varying densities, that terminate at a uniform depth.
<h3>Theories of isostasy</h3>
The Pratt hypothesis, developed by John Henry Pratt, an English mathematician, and an Anglican missionary, supposes that Earth's crust has a uniform thickness below sea level with its base everywhere supporting an equal weight per unit area at a depth of compensation.
<h3>
Pratt model </h3>
A model for the lithosphere that accounts for isostatic anomalies by assuming there is a level of compensation that lies at a constant depth everywhere. Below the level of compensation, all rocks have the same density, but above it, density decreases as topographic elevation increases.
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