For a given location, Crust 1.0 can provide a horizontal layered velocity model, including the 8 layers of water, ice, upper sediments, middle sediments, lower sediments, upper crystalline crust, middle crystalline crust, and lower crystalline crust.
· Whales use layers of water in the sea to communicate with each other over long distances.
After a few months, the distilled and saline layers of water intermingle, and the tank must be filled anew.
Traversing the North Atlantic, it crosses the equator and continues south, passing between two layers of water that are moving northward from the Antarctic Ocean.
In the ocean, sound waves can reflect off layers of water of different temperatures, allowing them to travel long distances without fading out.
But the nanochannels actually swell a little in water, opening up enough to let through two or three atomic layers of water and some ions.
Very small or microscopic animals remain at great depths during the day and rise at dusk, concentrating in the upper layers of water during the night.
Variations in the speed of sound cause sound waves to refract when they travel obliquely through layers of water that have different properties of salinity and temperature.
The boys describe a TV show they've been watching, about marine life, in which they've learned about the various layers of water, including the midnight zone, where no light reaches.
Probably internal waves occur wherever there is a boundary between layers of water that have different physical characteristics, just as the waves we see occur at the boundary between water and air.
