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Water attenuates light by absorption, so use of a dive light will improve a diver's underwater vision at depth. [1] As the depth increases, more light is absorbed by the water. Color absorption depends on the purity of the water - pure water is most transparent to blue frequencies, but impurities may reduce this significantly.
Many marine aquariums include a sump, which is an external container connected to the main aquarium with a water pump. In most setups, the sump is located below the aquarium and is fed water from the main tank via an overflow. An overflow at its simplest is a round hole drilled towards the top of the tank, connected via tubing to an output ...
Another light source in reef aquariums is metal halide lighting. These high output lights closely recreate the shimmering effect of bright tropical sun over a patch of coral reef. Metal halide bulbs come in a variety of spectra from 5000k on up to 20,000k and allow for a variety of light-hungry corals to survive under them.
Linear polarizing filters decrease visibility underwater by limiting ambient light and dimming artificial light sources. [1] While wearing a flat scuba mask or goggles, objects underwater will appear 33% bigger (34% bigger in salt water) or 25% closer than they actually are. [2] Also pincushion distortion and lateral chromatic aberration are ...
Mesmerizing, kaleidoscopic, and fabulously exotic, the huge variety of types of saltwater fish to pick for your aquarium will give you a visual taste of the underwater ocean world.
An underwater environment is a environment of, and immersed in, liquid water in a natural or artificial feature (called a body of water), such as an ocean, sea, lake, pond, reservoir, river, canal, or aquifer. Some characteristics of the underwater environment are universal, but many depend on the local situation.
Reef – Shoal of rock, coral, or other material lying beneath the surface of water Artificial reef – Human-made underwater structure that functions as a reef; Coral reef – Outcrop of rock in the sea formed by the growth and deposit of stony coral skeletons; Rocky reef – Natural reef of rock; Pinnacle (diving) – Distinct high point on a ...
Elliott Bay and the Seattle waterfront, looking north from the Pacific Coast Co. dock, c. 1907. West Point and Alki Point are the headlands into Puget Sound recognized as the northern and southern entrances of Elliott Bay respectively. A line drawn between these two points demarcates the bay to the east from the open sound to the west.
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