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Sonar is a way of communicating, navigating, and detecting objects by using sound propagation. For the remainder of this lesson, we will focus on underwater sonar, which is used by submarines and some aquatic animals to perform the previously mentioned tasks.
SONAR is also useful for mapping the ocean floor. We can't travel down all the way to the bottom of the ocean all over the earth. Some depths are too deep and we'd die. But, we can use SONAR to help map the ocean floor, which has all sorts of interesting features. SONAR is based on sound.