Why is sonar a more accurate way of mapping the ocean floor than weighted lines?

a joined transmitter and beneficiary called a transducer sends a sound heartbeat straight down into the water and the beat travels through the water and bouces off the sea base with the goal that the transducer can pickup the reflected sound

the precambrian aged rocks could be found in australia. australia is a region that has a lot of ancient civilization history from million years ago. in this region, there are a lot of recognizable fossils buried in its land which is considered a precambrian-aged rocks