Which physical characteristics of water are included as hydrographic information?

The correct answer includes temperature, salinity, and chemical content because these three physical characteristics play a vital role in understanding the hydrographic properties of a water body.

Temperature affects water density, circulation patterns, and the distribution of organisms within the water. It is also crucial for understanding thermal stratification, which can influence aquatic ecosystems and biogeochemical processes.

Salinity refers to the concentration of dissolved salts in water, which is essential for studying the mixing and layering of water masses, as well as how these characteristics impact marine life, particularly in estuarine environments where freshwater and saltwater meet.

Chemical content encompasses a range of dissolved substances, including nutrients, pollutants, and organic materials. This information is critical for assessing water quality, understanding ecosystem health, and managing resources effectively.

Thus, acknowledging all three of these characteristics—temperature, salinity, and chemical content—provides a comprehensive view of the hydrographic conditions present in a water body, making the complete answer the most informative and relevant for hydrographic surveying.