What describes a physiographic form known as a cone?

The correct description of a physiographic form known as a cone is indeed related to sediment deposits, specifically a cone shape created by sediment being washed from a gorge channel onto a wider area, typically referred to as a "alluvial fan" in geographical terms. This process results in a triangular or fan-shaped deposit that spreads out from the channel and can be quite prominent in the landscape.

While it's true that volcanic activity forms a cone-shaped mountain, which is referred to as a volcano, this is a distinct geological feature from a sedimentary cone. Similarly, a circular basin holding water describes a different physiographic feature altogether, often referred to as a lake basin or crater, not a cone. A cliff formed by erosion is also not applicable in this context, as it describes a different type of landform created through the process of erosion rather than deposition.

Understanding these definitions is crucial for recognizing different landforms and their characteristics, particularly in the context of erosion and sediment control, as they can significantly influence sediment transport and management strategies in various landscapes.