the mincral CRITICAL THINKING 29 Briefly explain the role of streams in the form
ID: 120034 • Letter: T
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the mincral CRITICAL THINKING 29 Briefly explain the role of streams in the formation of caverns, and the process by which several levels of 30. Explain why stalactites and stalagmites typically form in pairs and often merge to form a column 31 Why was the Yueca Mountain area selected for the national high-level radioactive waste repository vertically connected caves may form 32What are three reasons that some geologists are concerned about the Yucea Mountain site as a radioactive waste repository? 33 Why is the High Plains Aquifer being depleted 34. Under what conditions does subsidence occur and why is this such a problemExplanation / Answer
Ans.
29.Its formed by chemical reaction between circulating groundwater and bedrock composed of limestone or dolomite. These caves, called solution caves,Ground water play vital role because its erosinal works done by solution of easily soluble rocks like limestone.The water changed with corban dioxide dissolve limestone very easily.Different solution structure found like sinkholes,caverns ets. without ground water karst features dont devlope.
30. Both stalactites and stalagmites are types of speleothems, mineral deposits that form on the insides of caves through the deposition of soluble minerals such as calcium carbonate, which forms limeston.Stalactites form exclusively on ceilings as dissolved minerals drip down in the form of mineralized water, whereas stalagmites form where the dripping mineralized water touches the floor and deposits its minerals. Because they are formed as two parts of the same process, stalactites and stalagmites can grow to the point where they connect with one another. Such connected formations are called columns.Stalactites and stalagmites are types of mineral deposits found in caves that accrue through the processes of solution and deposition. Stalactites hang downwards from the ceiling of caves, Where mineralized water or another transmitting liquid drips from a cave ceiling. whereas stalagmites rise upwards from the floor of a cave. Where mineralized water or another transmitting liquid drops onto a cave floor.
31. Site is selected for dispository becouse Scientists used the droppings found in 12,000-year old desert packrat nests, known as middens, to investigate climatic and vegetation changes in the region since the last Ice Age. In this consistently dry environment, these middens were preserved under open rock ledges. Nuclear materials at the site will be much better protected. The area has been arid desert for thousands of years. The repository location is one of the few in the world where radioactive waste containers can be isolated from the environment by 1,000 feet of dry rock above them and yet be 1,000 feet above the water table.
32. A site for the geologic disposal of used nuclear fuel and high-level radioactive waste. Yucca Mountain sites, is favorable based on its geohydrology, geochemistry, rock characteristics, tectonics, meteorology, costs and socioeconomic impacts.Yucca Mountain site is remote, arid and geologically stable. It is one of the few locations in the world where containers storing radioactive materials can be isolated from the environment by 1,000 feet of dry rock below ground and the same distance above the water table. The area receives only seven inches of annual rainfall. Ninety percent of this rainfall runs off the side of the mountain ridge, is absorbed by vegetation or evaporates.The fraction of an inch of water that seeps through fractures in the rock eventually reaches a groundwater basin beneath the mountain that is completely closed. This water does not flow to any river or ocean, or to the aquifers that provide a major source of drinking water. It would take thousands of years for such small amounts of water to possibly breach the containers and transport any release of radioactivity to the environment.
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