Fin whale songs can reveal hidden features of the ocean floor
The sounds can penetrate Earth’s crust as seismic waves, illuminating its structure
![fin whale](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/02/021021_cg_whalesong_feat.jpg?fit=1030%2C580&ssl=1)
The song of the fin whale (one pictured) is among the loudest in the ocean — powerful enough to penetrate Earth’s crust, scientists say.
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