Which of the following is a primary characteristic of a Fill?

A primary characteristic of a Fill is raised earth material. This refers to the process of adding material to an area to create a raised surface, which is often done in construction or civil engineering projects. Fills are utilized to elevate the ground level where necessary, such as in building foundations, roadways, or embankments.

The concept of Fill is essentially grounded in earthwork, where material is excavated from one location and placed in another, allowing for adjustments to the topography or providing support for structures. Understanding Fill is crucial for land development, road construction, and other infrastructure projects where elevation changes are required.

In contrast, other options represent different geographical or engineering features. A depressed area in the ground refers to a depression or excavation rather than a Fill. A steep incline represents slopes rather than the flat surfaces typically associated with Fill. Flat terrain does not embody the raised aspect that a Fill has and typically suggests a level ground without additional elevation.