sedimentary rocks meaning in bengali

In this way, loose clasts in a sedimentary rock can become "glued" together. I thought it was a poem Such erosional material of a growing mountain chain is called molasse and has either a shallow marine or a continental facies. Thick sequences of red sedimentary rocks formed in arid climates are called red beds. Deltas are dominantly composed of clastic sediment (in contrast to chemical). Besides transport by water, sediment can in continental environments also be transported by wind or glaciers. The study of sedimentary rocks and rock strata provides information about the subsurface that is useful for civil engineering, for example in the construction of roads, houses, tunnels, canals or other structures. This means they form over time on the surface of the Earth, unlike other types of rock, such as igneous or metamorphic, which are created deep within the Earth under great pressure or heat. Skeletons of micro-organisms formed of silica (such as radiolarians) are not as soluble and still deposit. These are often elongated structures and can be used to establish the direction of the flow during deposition.[29][30]. Compaction is, for example, an important diagenetic process in clay, which can initially consist of 60% water. Differences between successive layers indicate changes to the environment over time. Mudrocks are sedimentary rocks composed of at least 50% silt- and clay-sized particles. The rate at which sediment is deposited differs depending on the location. Sedimentation is the collective name for processes that cause these particles to settle in place. Sometimes multiple sets of layers with different orientations exist in the same rock, a structure called cross-bedding. Six sandstone names are possible using the descriptors for grain composition (quartz-, feldspathic-, and lithic-) and the amount of matrix (wacke or arenite). [51][52] Climate change can influence the global sea level (and thus the amount of accommodation space in sedimentary basins) and sediment supply from a certain region. This structure forms when fast flowing water stops flowing. Organic material is formed from dead organisms, mostly plants. When these organisms die, their skeletons sink to the bottom, forming a thick layer of calcareous mud that may lithify into limestone. This can result in the precipitation of a certain chemical species producing colouring and staining of the rock, or the formation of concretions. The latter category includes all kinds of sudden exceptional processes like mass movements, rock slides or flooding. --Steven Wright, Post-traumatic stress disorder বা দুর্ঘটনা পরবর্তী মানসিক ব্যাধি হলো একটি মানসিক স্বাস্থ্যের অবস্থা যা একটি ভীতিজনক ঘটনা দ্বারা উদ্দীপ্ত হয় - হয় এটির অভিজ্ঞতা থেকে বা প্রত্যক্ষভাবে দেখার কারণে ।, Pervasive Developmental Disorders বা ব্যপ্তিশীল বিকাশজনিত ব্যাধিসমূহ সামাজিকীকরণ এবং যোগাযোগ দক্ষতার বিকাশের ক্ষেত্রে বিলম্বের দ্বারা চিহ্নিত এক ধরনের রোগকে বোঝায়।, Mental Health Services বা মানসিক স্বাস্থ্য সেবাগুলি একজন ব্যক্তির বা গোষ্ঠীর মানসিক অসুস্থতা, উপসর্গ, শর্ত বা ব্যাধি দূর করতে সহায়তা করার জন্য একটি পেশাদার সম্পর্কের ক্ষেত্রে মূল্যায়ন, রোগ নির্ণয়, চিকিত্সা বা পরামর্শ হিসাবে সংজ্ঞায়িত হয়।. As their name implies, sedimentary rocks are formed from sediment, which is an assemblage of unconsolidated earth materials. [37] While the clastic bed is still fluid, diapirism can cause a denser upper layer to sink into a lower layer. ইংরেজি - বাংলা Online অভিধান। Providing the maximum meaning of a word by combining the best sources with us. Sediment transported by wind is called aeolian and is always very well sorted, while sediment transported by a glacier is called glacial till and is characterized by very poor sorting. The nature of a sedimentary rock, therefore, not only depends on the sediment supply, but also on the sedimentary depositional environment in which it formed. Sedimentary rocks can be subdivided into four groups based on the processes responsible for their formation: clastic sedimentary rocks, biochemical (biogenic) sedimentary rocks, chemical sedimentary rocks, and a fourth category for "other" sedimentary rocks formed by impacts, volcanism, and other minor processes. On the other hand, when a rock layer with a certain age is followed laterally, the lithology (the type of rock) and facies eventually change. The facies of all rocks of a certain age can be plotted on a map to give an overview of the palaeogeography. The same process can form mud volcanoes on the surface where they broke through upper layers. [39] Such faulting can also occur when large masses of non-lithified sediment are deposited on a slope, such as at the front side of a delta or the continental slope. That new rock layers are above older rock layers is stated in the principle of superposition. Only fine particles can be transported to such places. Fungi and plants (by their roots) and various other organisms that live beneath the surface can also influence diagenesis. On the other hand, when the pore fluid pressure in a sand layer surpasses a critical point, the sand can break through overlying clay layers and flow through, forming discordant bodies of sedimentary rock called sedimentary dykes. The type of sediment transported depends on the geology of the hinterland (the source area of the sediment). Sedimentation is the collective name for processes that cause these particles to settle in place. Here's how you say it. Every environment has a characteristic combination of geologic processes, and circumstances. In the case of transgression, deeper marine facies are deposited over shallower facies, a succession called onlap. The material is then transported from the source area to the deposition area. Density contrasts between different sedimentary layers, such as between sand and clay, can result in flame structures or load casts, formed by inverted diapirism. Such infill is called flysch. [47], The situation in which coastlines move in the direction of the continent is called transgression. about everything." A sequence of maps for different ages can give an insight in the development of the regional geography. Clastic sedimentary rocks, are subdivided according to the dominant particle size.

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