What does altitude measure?

Altitude specifically measures the distance above sea level. This term is commonly used in various fields, including geography, aviation, and environmental science, to denote how high a location is relative to the average level of the ocean. For instance, when discussing mountainous regions, elevation points are often stated in meters or feet above sea level. This measurement is crucial for understanding climate variations, ecosystem distribution, and even weather patterns, as altitude can significantly influence temperature, vegetation, and fauna found in an area.

Other options reflect different concepts; for example, distance below sea level pertains to bathymetry or specific geological features like ocean trenches or valleys. The width of a river describes its physical dimension, unrelated to altitude, while atmospheric temperature concerns climatic conditions rather than elevation. Understanding altitude allows researchers and students to appreciate the relationship between height and various environmental factors.