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Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries. The water may be in the ocean, a lake, a river or a tank. Typical frequencies associated with underwater acoustics are between 10 ...
Video shows the whale breaching the water and striking the rear of the boat. At least one of the boaters is seen plunging into the water. ocean whale breach animal wild (Courtesy Colin Yager)
Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water ( bathymetry ). It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight, along with knowledge of the speed of sound in water, allows determining ...
The Coast Guard came to the rescue of five people who were clinging to a cooler in Lake Erie after their boat was swamped by a wave far off the Ohio coast, authorities said. The 22-foot boat was ...
Mercury is a neurotoxin, so if you get too much of it, it can harm the nervous system, says Yawitz. But the reputation mercury gets as bad-for-you is a bit deceptive, as you really need to eat a ...
Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...
If that does not work, and a shark tries to bite a swimmer—or even has a limb in its mouth—Naylor says the best course of action is to poke the shark hard in the eyes. Then, one should reverse ...
Oceanic crust is the uppermost layer of the oceanic portion of the tectonic plates. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. [1] [2] The crust overlies the rigid uppermost layer of the mantle.