Final answer:
When a great number of radio waves are reflected back from a particular area on the radar, it indicates that there is a large amount of rain or snow in that area.
Step-by-step explanation:
When a great number of radio waves are reflected back from a particular area on the radar, it indicates that there is a large amount of rain or snow in that area. Radar is a tool used by scientists to detect and analyze weather formations, including precipitation. By measuring the intensity of the returned waves, meteorologists can determine the presence and severity of rain or snow in a specific location.