Which of the following is a minimum requirement for the body of a boundary monument?

The minimum requirement for the body of a boundary monument being metal or a durable material is grounded in the purpose and importance of boundary monuments in land surveying. These monuments serve as permanent markers to define property lines and prevent disputes over land ownership.

Using metal or durable materials ensures that the monument can withstand the test of time and resist environmental factors such as weathering, erosion, and physical impacts. Metal, in particular, is resistant to rust and corrosion, especially when treated or coated appropriately, making it an ideal choice for long-lasting durability. This longevity is crucial in maintaining accurate land records over the years as plats and boundaries can change without reliable markers.

Other materials like wood, while potentially usable, do not provide the same level of durability as metal and are prone to decay or damage over time. Similarly, plastic may not possess the necessary longevity and resilience for a monument that must remain intact and visible for decades or even centuries. Glass or crystal, on the other hand, while aesthetically pleasing, would lack the structural integrity required for a boundary monument, making them unsuitable for this purpose.

Hence, by requiring metal or a durable material for boundary monuments, the standards emphasize the necessity for reliability and permanence in land surveying practices.