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tufa 音标拼音: [t'ufə]

n. 凝灰岩;多孔凝灰岩

凝灰岩;多孔凝灰岩

WordNet (r) 3.0 (2006) (WordNet)

tufa
n 1: a soft porous rock consisting of calcium carbonate
deposited from springs rich in lime [synonym: {tufa}, {calc-
tufa}]
2: hard volcanic rock composed of compacted volcanic ash [synonym:
{tuff}, {tufa}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Tufa \Tu"fa\, [It. fufo soft, sandy stone, L. tofus, tophus. Cf.
{Tofus}, {Toph}, and {Tophin}.] (Min.)
(a) A soft or porous stone formed by depositions from water,
usually calcareous; -- called also {calcareous tufa}.
(b) A friable volcanic rock or conglomerate, formed of
consolidated cinders, or scoria.
[1913 Webster]

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英文字典中文字典相关资料:

Tufa - Wikipedia
Tufa (tuft, calc-tuff or tophus) 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
Tufa : Properties, Formation, Uses - Geology Science
Tufa is a type of porous limestone formed by the precipitation of calcium carbonate from water, often in environments where freshwater meets carbon-dioxide-rich waters, such as springs, streams, and lakes Tufa deposits are typically found in areas with specific geological and hydrological conditions, making them both unique and valuable for scientific study
What is tufa? - U. S. National Park Service
I'm the Natural Resources Program Manager here One of the interesting rock formations that you'll find in geothermal parks is similar or the same as what you see behind me and we call it tufa Now what is tufa and what sets it apart from say sandstone or limestone? Tufa is an evaporite, or at least that's what geologists call it
26 Facts About Tufa
Discover 26 fascinating facts about tufa, a unique geological formation Learn about its origins, types, and where you can find these natural wonders
Talking Tufa | North American Rock Garden Society - NARGS
The formation of tufa is in effect a reversal of this dissolving process in that groundwater rich in dissolved carbonate and carbon dioxide wells up from the ground and loses carbon dioxide due to warming, consumption by photosynthesizing plants, or agitation and evaporation When this happens, calcium is reprecipitated as the carbonate in the vicinity of the springs or seeps So tufa and
What Is a Tufa and How Does It Form? - Biology Insights
Tufa is a remarkable sedimentary deposit that forms in freshwater environments, representing a type of limestone This material is primarily defined by its highly porous and lightweight nature, contrasting it with denser, more compact carbonate rocks Tufa is typically found where calcium-rich water meets the atmosphere, often in springs, lakes, or streams The resulting deposits have long
Tufa - Mono Lake
How does tufa form? All tufa at Mono Lake forms underwater Beneath Mono Lake, calcium-rich freshwater springs seep up from the lake bottom and mix with lake water rich in carbonates (think baking soda) As the calcium comes in contact with the carbonates in the lake, a chemical reaction occurs, resulting in calcium carbonate, or limestone The calcium carbonate precipitates (settles out of
TUFA Climbing
TUFA Climbing specializes in technical bags and backpacks for rock climbing Designed for climbers pushing their limits Made in USA
Tufa: Mineral information, data and localities. - mindat. org
A limestone formed when carbonate minerals precipitate out of ambient temperature water A chemical sedimentary rock composed of calcium carbonate,
How To Make a Hypertufa Garden Trough - This Old House
Hypertufa is a lightweight, porous material that mimics natural tufa rock It’s made from a mixture of cement, peat moss, and perlite, creating a durable yet breathable container perfect for plants Gardeners love hypertufa troughs for their many beneficial characteristics: Affordable compared to genuine stone troughs Customizable in shape

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