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Deep scattering layer

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Deep scattering layer

The deep scattering layer, sometimes referred to as "The Sound Scattering Layer" or, historically, ECR layer; is the name given to a layer in the ocean consisting of a variety of marine animals. It was discovered through the use of sonar, as ships found a layer that scattered the sound and was thus sometimes mistaken for the seabed. For this reason it is sometimes called the "false bottom" or Phantom bottom. It can be seen to rise and fall each day in keeping with diel vertical migration.

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