Depth measurement is the process of determining the distance from the surface of a liquid or solid to a specific point below it. This technique is commonly used in various fields, including marine navigation, geology, and construction. Tools like sonar and depth gauges help provide accurate readings, ensuring safety and efficiency in operations. In marine environments, depth measurement is crucial for safe navigation, as it helps vessels avoid underwater obstacles. In geology, it assists in studying sediment layers and understanding earth formations. Accurate depth measurement is essential for effective planning and resource management in many industries.