GEOGRAPHY-OBJ

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No2b) four Characteristics of the lithosphere




1- Rigid components




2- Predominance of sedimentary rock

 

3- Soil of organic and inorganic substances




4- Division of plates

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3a)

Outwash Plain

Also called a sandur, an outwash plain is formed by glaciers. Such a plain is formed when a glacier deposits sediments at its terminus. As a glacier moves, it erodes the bedrock and carries the eroded sediments downstream. These sediments are deposited by the meltwater of the glacier at the snout. Outwash plains are a common landform in Iceland. The Skeiðarársandur in Iceland is the world’s largest outwash plain with an area of 1,300 square km.




Till Plain

A till plain is also a plain formed by glacial action. Such plains are formed by the deposition of glacial till (unsorted glacial sediment). When a sheet of glacial ice gets detached from the main glacier and melts in place, the sediments are deposited on the ground to result in the formation of a till plain. Such plains can be seen in northern Ohio where they were created by the Wisconsin glaciation.




Scroll Plain

Scroll plains are formed in areas where a river meanders across a low gradient. Deposition of sediments at such locations results in the formation of a plain. Oxbow lakes are common occurrences in such areas. The Taieri River forms a spectacular scroll plain near Paerau in New Zealand.

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3b.

1. most Plains have fertile soil and are,thus, ideal for agriculture.




2. river Plains have abundant supply of water, which is very useful for human settlements.




3. the flat surface of plains help in the construction of transport network, buildings Industries etc.

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No 6.




(Choose 3)




-Abrasion or corrasion - This is when large pieces of bedload material wear away the river banks and bed.




-Attrition - This is when the bed load itself is eroded when sediment particles knock against the bed or each other and break, becoming more rounded and smaller.




-Hydraulic Action - This is when the force of water erodes softer rock.




-Solution or corrosion - This is when acidic water erodes rock.




6b




-wider valleys

-shallower valleys

-meanders

- oxbow lakes.

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(Number  7)

*(7a)*

Environmental hazard simply refers to disasters which affect lives and properties within environment as a result of the action of man and other natural phenomena




*(7b)*

*(Pick two)*

(i)Deforestation exposes the land surface to erosion




(ii)It leads to deterioration of environment




(iii)It increase evaporation and lowers the water table




(iv)It leads to reduction of soil nutrient




*(7c)*

*(Pick three)*

(i)Drought threats plant life which leads to crop failure




(ii)It leads to high loss of crops and livestock




(iii)it causes reduction in agricultural productivity




(iv)it causes conflicts between farmers and pastoralists




(v)It can lead to scarcity of food and also lead to desertification







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