The products of weathering are transported in rivers as bed-load, suspended load
ID: 106348 • Letter: T
Question
The products of weathering are transported in rivers as bed-load, suspended load and dissolved load until such time as they are deposited where they may undergo lithification and turn into rocks. Describe the distribution and location of deposition of each of these sediment sub-groups, and the types of sediments that arc depositive, in the event of the river entering a marine environment. Using your knowledge of chemical bonding in minerals and its impact on mineral properties, and the unique properties of water molecules, describe why some minerals are more susceptible to chemical AND mechanical weathering than others? Chemical and mechanical weathering are both irreversible processes that produce sediments. However, there is a fundamental difference between the two processes in terms of the compositional and mineralogical relationship between the parent rock and the sediment produced by the weathering processes. Describe what that fundamental difference is and the reasons behind it. During transport of sediments through the sedimentary cycle the size, shape, and so-called maturity of the sediments changes. Can you describe what the changes are and some of their causes? Describe the distribution of water flow velocity in a stream channel and its impact on the transportation and deposition of sediments as a function of their size?Explanation / Answer
15.Many products are deposited due to the action of weathering. Small and large particles are also transmitted along the sea shore and along the river bed. These deposits as days pass by get strongly pressed to the soil due to the water and heavily blowing winds. These deposits after getting deeply deposited inside form some products with the underlying elements like potassium ,calcium etc. These products get strongly deposited in the form of large masses foeming a rock structure.
These rock structures are so strong such that cannot be broken up by natural processes.
16.Minerals are nithing but combination of two or more elements. These minerals are more susceptible to chemical and mechanical weathering processes because minerals contain one or more elements and when some chemical changes occur,the elements in the minerals react with the elements in the chemicals and form new products. These chemical changes may take place due to weather changes and also when these minerals come in contact with other elements.
Thus minerals get many changes in their composition when other elements react with them. This may lead to the formation of new products were som may be stable and some may be unstable.
17.In case of chemical weathering,the products formed may be unstable at some point of time until they come contact with any other chemical component. Chemical weathering takes place when a strong chemical makes some changes in the acid level of least strong chemical or element and thus a new product is formed.
In case of mechanical weathering the products formed may be strong as they are formed due to the action of wind and washing waves. These products may be stiffly attached to a particular place in the shore and turn into large masses leading to the formation of rocks.
18.When a sediment is formed,they may be in a particular size. When they are transported from one place to another they get changes in size and shape because they may undergo further actions like wind,water etc which may cause further degradation of the particles. Sometimes human and animal intervention may also be responsible for these changes.
19. The distribution of water flow velocity in a stream in uneven because the speed with which the stream flows is very large and the sediment distribution may be distorted and the large sized particles may get settled down while smaller size particles may be carried away.
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