This short review aims to provide some examples where terrestrial earth sciences—including, for this purpose, geology, engineering geology, soil science, pedology, hydrology, hydrogeology, geography, geomorphology and environmental sciences—do not interact sufficiently to ensure optimal results. Apart from different terminologies (for instance, “soil”), different specialist fields claim expertise over certain disciplines or portions of the Earth’s crust without a proper understanding of the influence of other specialist fields. This severely limits interdisciplinary understanding, and it is recommended that a better understanding of interdisciplinary definitions is required to ensure a wider audience. Although this is not a technical article in its own right, this forms part of a study to link vadose zone hydrology for the disciplines as noted earlier, thereby creating hopefully a platform for easier communication.