State four applications of echo

Here are four applications of echo:

• Sonar (Sound Navigation and Ranging): Used by ships and submarines to detect underwater objects, measure ocean depth, and map the seafloor.
• Medical Ultrasound: Utilized to create images of internal body organs and structures, such as in prenatal scans or diagnosing medical conditions.
• Echolocation: Employed by animals like bats and dolphins to navigate, locate prey, and avoid obstacles in their environment.
• Geological Exploration: Used in seismic surveys to locate underground oil, gas, and mineral deposits by analyzing reflected sound waves.