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Abri du Poisson, a small cave in the Gorge d'Enfer, a small side valley of the Vézère in Les Eyzies; it was discovered in 1892, but the more than 1 metre long engraving of a fish which gives it its name was only found in 1912. Dating to the middle Gravettian, circa 25,000 years ago, it is one of the oldest known depictions of a fish in the ...
The longships had two methods of propulsion: oars and sail. At sea, the sail enabled longships to travel faster than by oar and to cover long distances overseas with far less manual effort. Sails could be raised or lowered quickly. In a modern facsimile the mast can be lowered in 90 seconds.
Stygofauna have adapted to the limited food supply and are extremely energy efficient. Stygofauna feed on plankton, bacteria, and plants found in streams. [2] Orconectes australis, a cave crayfish. To survive in an environment where food is scarce and oxygen levels are low, stygofauna often have very low metabolism. As a result, stygofauna may ...
The Hedeby 1, also known as the Ship from Haithabu Harbour, was a Viking longship that was excavated from the harbor of Hedeby, a Viking trading center located near the southern end of the Jutland Peninsula, now in the Schleswig-Flensburg district of Schleswig-Holstein, Germany. The Hedeby 1 ship at the Hedeby Viking Museum in Busdorf, Germany
Typically, an aquascape houses fish as well as plants, although it is possible to create an aquascape with plants only, or with rockwork or other hardscape and no plants. Aquascaping appears to have begun to be a popular hobby in the 1930s in the Netherlands, following the introduction of the Dutch-style aquascaping techniques.
Most rocks around Alta are overgrown with a thick growth of moss and lichen; once carvings have been discovered, these plants are carefully removed and the rock is cleaned to expose the full extent of the carvings. The carvings are then documented using different techniques, most often the combination of quartz powder painted into the carvings ...
This method is known as spat stocking. At the Great Barrier Reef Aquarium in Townsville, Australia, large colonies of Acropora formosa have collection devices placed above them during spawning. [25] Small mature colonies are transplanted from the reef into a tank for spawning. They can then be reattached to the reef.
Sculptures can be carved via either the direct or the indirect carving method. Indirect carving is a way of carving by using an accurate clay, wax or plaster model, which is then copied with the use of a compass or proportional dividers [1] or a pointing machine. The direct carving method is a way of carving in a more intuitive way, without ...
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