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Ferrocement or ferro-cement [1] is a system of construction using reinforced mortar [2] or plaster (lime or cement, sand, and water) applied over an "armature" of metal mesh, woven, expanded metal, or metal-fibers, and closely spaced thin steel rods such as rebar. The metal commonly used is iron or some type of steel, and the mesh is made with ...
The advantage of ferrocement construction is that materials are cheap and readily available, while the disadvantages are that construction labor costs are high, as are operating costs. (Ferrocement ships require thick hulls, which results in either a larger cross-sectional area that hurts hydrodynamics, or leaves less space for cargo.)
Knowing that the Inuit had made tools from the Cape York meteorite, mainly due to Sir John Ross' discovery that the natives of Greenland used iron knives, Nordenskiöld landed at Fortune Bay on Disko Island to search for the material. The Inuit had told Ross that they got the iron from high on a mountain, at a site where two large boulders lay.
The Images of Change project provides side-by-side photos of the same place over time to document the environment changes caused by nature and man. NASA's before and after images show Earth's ...
The winners of the 2024 European Wildlife Photographer of the Year awards have been announced. Launched in 2001, this competition is one of the most prestigious in modern nature photography.
Earth from Above is a United Nations-supported ecological project conceived and led by Yann Arthus-Bertrand. The project includes a photo essay -style collection of aerial photography produced by Arthus-Bertrand, in which the photographer captured vistas of Earth from various aircraft during a ten-year period. [ 1 ]
The Elephant's Foot is the nickname given to the large mass of corium, composed of materials formed from molten concrete, sand, steel, uranium, and zirconium.The mass formed beneath Reactor 4 of the Chernobyl Nuclear Power Plant, near Pripyat, Ukraine, during the Chernobyl disaster of 26 April 1986, and is noted for its extreme radioactivity.
In today's puzzle, there are eight theme words to find (including the spangram). Hint: The first one can be found in the top-half of the board. Here are the first two letters for each word: