Echo sounding - Wikipedia
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Echo_Sounding_USN.jpg/1200px-Echo_Sounding_USN.jpg)
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Echo, Marvel Cinematic Universe Wiki
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![](https://upload.wikimedia.org/wikipedia/commons/b/bf/Echo_Sounding_of_Newly_Discovered_Canyon_in_the_Red_Sea_MOD_45155032.jpg)
File:Echo Sounding of Newly Discovered Canyon in the Red Sea MOD 45155032.jpg - Wikimedia Commons
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Depth sounding - Wikipedia
![](https://www.researchgate.net/profile/Ivan-Mincev/publication/281266651/figure/fig1/AS:468913797505025@1488809169893/Position-of-the-catchment-of-the-reservoir-Gradce-in-Macedonia_Q320.jpg)
Theory of echo-sounding (source: Wikipedia)
![](https://owaysonline.com/wp-content/uploads/Principles-of-Echo-Sounder.jpg)
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