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A type of single use underwater lighting source that was in limited use during the 1950s is the magnesium torch, a pyrotechnic device using magnesium metal that could be ignited and would burn underwater. It produced a bright white all-round light, and once activated would continue to burn until exhausted.
Algae often grow in very high densities in ponds because of the high nutrient levels that are typical of garden ponds. Generally, algae attaches itself to the sides of the pond and remains innocuous. Some species of algae, such as "blanket weed", can grow up to a foot a day under ideal conditions and can rapidly clog a garden pond. On the other ...
This garden pond has two ponds separated by a waterfall with a one-foot drop; generally, the fish in the upper pond are smaller, and ones in the lower pond are larger. Ponds may be created by natural processes or by people; however, the origin of the hole in the ground makes little difference to the kind of wildlife that will be found in the pond.
The SeaPerch is an educational tool and kit that allows elementary, middle, and high-school students to construct a simple, remotely operated underwater vehicle, or Remotely Operated Vehicle (ROV), from polyvinyl chloride (PVC) pipe and other readily made materials. The SeaPerch program is a curriculum designed program that teaches students ...
An infinity pool [note 1] is a reflecting pool or swimming pool where the water flows over one or more edges, producing a visual effect of water with no boundary. Such pools are often designed so that the edge appears to merge with a larger body of water such as the ocean, or with the sky, and may overlook locations such as natural landscapes ...
A compressor on shore pumps air through a hose, which is connected to an underwater aeration unit. Attached to the unit are a number of diffusers. These diffusers come in the shape of discs, plates, tubes or hoses constructed from glass-bonded silica, porous ceramic plastic, PVC or perforated membranes made from EPDM (ethylene propylene diene ...
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