Final answer:
Salt wedging is not a form of physical weathering prevalent in the humid tropics; it is more common in arid regions where salts can accumulate and contribute to rock disintegration.
Step-by-step explanation:
The statement 'Salt wedging is a form of physical weathering especially prevalent in the humid tropics' is false. Salt wedging is a process that typically occurs in arid or semi-arid regions, where water evaporates and leaves behind salts that can exert pressure on the surrounding rock, contributing to the rock's disintegration. In contrast, the humid tropics are characterized by high levels of precipitation, which would tend to dissolve and remove salts rather than allowing them to accumulate and drive the wedging process.