Search results
Results from the WOW.Com Content Network
Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine or thermogene travertine .
Small-scale molds used for this form of casting have most commonly been made of sand, tufa stone, and cuttlebone [2] as well as charcoal and plaster [3] as these materials are generally easy to shape (unlike iron or steel), do not break down when suddenly exposed to high temperatures (unlike glass, wood, or plastic), do not deform easily ...
It is the dominant type of stone used in construction in Armenia's capital Yerevan, [61] [62] Gyumri, Armenia's second largest city, and Ani, the country's medieval capital, now in Turkey. [63] A small village in Armenia was renamed Tufashen (literally "village of tuff") in 1946.
There are two common forms of flowstones, tufa and travertine. Tufa is usually formed via the precipitation of calcium carbonate, and is spongy or porous in nature. Travertine is a calcium carbonate deposit often formed in creeks or rivers; its nature is laminated, and it includes such structures as stalagmites and stalactites.
The Trona Pinnacles are an unusual geological feature in the California Desert National Conservation Area. [1] The landscape consists of more than 500 tufa spires (porous rock formed as a deposit when springs interact with other bodies of water), some as high as 140 ft (43 m), rising from the bed of the Searles Lake (dry) basin.
The doctor also warned of red meat potentially leading to weight gain and obesity, which can cause inflammation and in turn raise the risk of dementia. "Red meat may also lead to heart disease ...
A hand-shaped planter made of hypertufa. Aggregates are generally Sphagnum (peat moss), sand, and perlite or vermiculite. [1] Coconut coir is coming to take the place of sphagnum moss, as the latter is a very slowly renewing natural resource and the former is a ready byproduct of the coconut industry— it has all the advantages of the moss but without the environmental costs.
Reading skills for eighth-graders hit their lowest level since testing began in 1992. Levels for fourth-graders were also near record lows as educators struggle to keep students engaged in a post ...