Final answer:
A cumulative plot of area versus elevation is known as a hypsometric curve, which is related to geography and topography.
Step-by-step explanation:
A cumulative plot of area versus depth or elevation is (a) hypsometric curve. A hypsometric curve represents the distribution of area with respect to elevation or depth, and it is used in various fields, including geography and earth sciences, to analyze the characteristics of landforms such as mountain ranges, basins, and the sea floor. The elevation is a crucial aspect of this curve as it can help to provide insights into the overall shape and topography of a region.