Compare Airy's and Pratt's theories on isostasy with the help of a figure.

Airy's and Pratt's theories explain the concept of isostasy, which is the state of gravitational equilibrium between Earth's crust and mantle. Both theories describe how the Earth's crust "floats" on the denser, more fluid mantle but differ in their approach.

Airy's theory suggests that the Earth's crust has a uniform density but varies in thickness. According to this theory, areas with ___ __________ ________ __________ ______ ______ __________ ___ ___ ______.
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