Which load type is described as being variable in intensity and often temporal?

The description of a load type as being variable in intensity and often temporal aligns well with dynamic load. Dynamic loads are characterized by changes over time, which can occur due to factors like motion, vibration, or fluctuating forces. These loads are not constant but instead vary due to the movement of the structure or external factors acting on it, making their effects on materials and structures quite different from static loads.

In contrast, static loads remain constant over time and do not change in intensity, making them less representative of what is described. Impact loads are sudden and relate to forces applied abruptly to a structure, while differential loads refer to variations in load across a surface or structure. Neither of these adequately captures the aspect of variability in intensity and time that is central to the definition of dynamic loads. Thus, the choice of dynamic load as the correct answer reflects its inherent characteristics accurately.