Topographic map of the sea is which type?

• A. Aeronautical Chart
• B. Bathymetric Map
• C. Hypsometric Map
• D. Chart

Answer: (B)

Bathymetric mapping describes the underwater surface of the sea. It shows the depths and shapes of the ocean floor, using contour lines called isobaths to illustrate features like trenches, shelves, and seamounts. Depths are often listed relative to sea level, highlighting the seabed relief just as topographic maps do for land. This is why a topographic map of the sea is called a bathymetric map. Aeronautical charts serve air navigation, not seabed topography; hypsometric maps are general elevation maps (typically of land, though they can combine land and sea in some contexts); a chart is a broad navigational graphic, not specifically the seabed’s relief.