IF U WRITE ALL ANSWER I WILL GIVE U HIGHEST B SYMBOLS I. Answer the following: 1. Define sand Dunes 2. What is mushroom Rock? 3. Insealberg means 4. Define Loess Plains. II. Match the following: Group A Group B 1. Sunder bans ( ) A) Sharavthi 2. Grand Canyon ( ) B) Highest water fall 3. Byson Gorge ( ) C) Largest Delta in the world 4. Jog falls ( ) D) Godavari 5. Angel waterfall ( ) E) Colorado III.Chose the Correct Answers: 1. The Unstable hills of sand are called _____________ a) The sand dunes b) Loess c) inselberg d) mushroom rock 2. The Hard top of the earth is ( ) a) Litosphere b) biosphere c) hydrosphere d) atmosphere 3. Identify the odd one ( ) a) Sea cliff b) stack c) inselberg d) sea 4. Identify the odd one ( ) a) Motains b) U – shaped valleys c) V –shaped valleys d)glaciers 5. A head land cutting out into sea is __________ a) Bay b) cape c) search d) sea cliff IV. Activity Draw the shape of mushroom rock
Answers
Explanation:
Which is not an erosional feature of sea waves?
Cliff
Beach
Sea cave
Answer: (b) Beach
The depositional feature of a glacier is:
Flood plain
Beach
Moraine
Answer: (c) Moraine
Which is caused by the sudden movements of the earth?
Volcano
Folding
Flood plain
Answer: (a) Volcano
Mushroom rocks are found in:
Deserts
River valleys
Glaciers
Answer: (a) Deserts
Ox bow lakes are found in:
Glaciers
River valleys
Glaciers
Answer: (b) River valleys
Answer the following questions:
Why do the plates move?
Answer: The tectonic plates move because of the movement of molten magma inside the earth.
What are exogenic and endogenic forces?
Answer: The forces that act in the interior of the earth are called endogenic forces. The exogenic forces are the forces that work on the exterior (surface) of the earth.
What is erosion?
Answer: The wearing away of landscape by different agents like wind, water and ice.
How are flood plains formed?
Answer: When the river overflows its banks, the neighbouring areas get flooded. When the river floods, it deposits layers of fine soil and other material called sediments along the banks of the river. This leads to the formation of a floodplain.
What are sand dunes?
Answer: They are low hill – like structures when the blowing wind (which lifts and transports sand from one place to another), stops blowing. The sand falls and gets deposited in low hill – like structures called sand dunes.
How are beaches formed?
Answer: The sea waves deposit sediments along the shores. This leads to the formation of beaches.
What are ox bow lakes?
Answer: Due to continuous erosion and deposition along the sides of the meander, the ends of the meander loop come closer and closer. When this happens, over a course of time, the meander loop cuts off from the river and forms a cut – off lake. Such a lake is also called an ox-bow lake.
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Answer:
Model Answer
The wind is the main geomorphic agentespecially in the hot deserts. Winds have a dual role in creating Erosional landforms and other in creating Depositional landforms.
These geomorphic features are most typically found in arid environments where there is little vegetation, where there are frequently strong winds etc. The landforms which are created by erosional and depositional activities of wind are called as Aeolian Landforms.
The various erosional landforms are as follows:
Pediplains: The high relief structures in deserts are reduced to low featureless plains by the activities of wind.
Deflation Hollows: Deflation is the removal of loose particles from the ground by the action of wind. When deflation causes a shallow depression by persistent movements of wind, they are called as deflation hollows.
Ventifacts: These are rocks that have been abraded, pitted, etched, grooved, or polished by wind-driven sand.
Mushroom Tables: In deserts, a greater amount of sand and rock particles are transported close to the ground by the winds which cause more bottom erosion in overlying rocks than the top. This result in the formation of rock pillars shaped like a mushroom.
Other forms: Inselbergs, Zeugen (formed when more resistant rock is reduced at a slower rate than softer rocks), Yardangs(ridge of rock formed usually parallel to the prevailing wind direction.
The various depositional landforms created by winds are as follows:
Sand dunes: Dry hot deserts are good places for sand dune formation. There are varieties of sand dune forms like Barchans, Seifs
Parabolic dunes: They are U-shaped and are much longer and narrower than barchans.
Ripple Marks: These are depositional features on a small scale formed by saltation (transport of hard particles over an uneven surface in a turbulent flow of air).
Loess: When the surface is covered by deposits of wind-transported silt that has settled out from dust storms.
This suggest that the wind plays an important role in erosion and deposition and consequent formation of new land forms.