Final answer:
The identifying characteristic of an intermodal tank is a box-like steel frame. This design allows for easy stacking and transportation of the containers by trucks, trains, barges, and ships.
Step-by-step explanation:
The identifying characteristic of an intermodal tank is a box-like steel frame. Intermodal containers, which are used for shipping goods, are designed with a rectangular shape and a steel frame that provides strength and durability. This design allows for easy stacking and transportation of the containers by trucks, trains, barges, and ships. The box-like steel frame is a key feature that distinguishes intermodal tanks from other types of tanks.