Class 7 Geography Chapter 3 Our Changing Earth
Answer the following questions.
(i) Which is not an erosional feature of sea waves?
(a) Cliff (b) Beach (c) Sea cave
Answer - (b) Beach
(ii) The depositional feature of a glacier is:
(a) Flood plain (b) Beach (c) Moraine
Answer - (c) Moraine
(iv) Mushroom rocks are found in:
(a) Deserts (b) River valleys (c) Glaciers
Answer - (a) Deserts
(v) Ox bow lakes are found in:
(a) Glaciers (b) River valleys (c) Deserts
Answer - (b) River valleys
Match the following.
(i) Glacier (a) Sea shore
(ii) Meanders (b) Mushroom rock
(i) Some rocks have a shape of a mushroom.
(iii) Sea caves are turned into stacks.
(iv) Buildings collapse due to earthquakes.
(i) Why do the plates move?
Answer - The plates move because of the movement of the molten magma inside the earth.
(ii) What are exogenic and endogenic forces?
Answer - The forces that work on the surface of the earth are called as exogenic forces. The forces which act in the interior of the earth are called as endogenic forces.
(iii) What is erosion?
Answer - The wearing away of the landscape by different agents like water, wind and ice is called erosion.
(iv) How are flood plains formed?
Answer - When river overflows its banks, it flood off its neighbouring areas which deposits layers of fine soil and other
material called sediments along its banks. This leads to the formation of a flat fertile floodplain.
(v) What are sand dunes?
Answer - The low hill like structures formed due to deposition of sand at one place by the wind in the desert is called sand dunes.
(vi) How are beaches formed?
Answer - The sea waves deposit sediments along the shores which leads to the formation of beaches.
(vii) 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 which in some time cuts off from the river and forms a cut- off lake, called an ox-bow lake.
Tick the correct answer.
Answer - The plates move because of the movement of the molten magma inside the earth.
(ii) What are exogenic and endogenic forces?
Answer - The forces that work on the surface of the earth are called as exogenic forces. The forces which act in the interior of the earth are called as endogenic forces.
(iii) What is erosion?
Answer - The wearing away of the landscape by different agents like water, wind and ice is called erosion.
(iv) How are flood plains formed?
Answer - When river overflows its banks, it flood off its neighbouring areas which deposits layers of fine soil and other
material called sediments along its banks. This leads to the formation of a flat fertile floodplain.
(v) What are sand dunes?
Answer - The low hill like structures formed due to deposition of sand at one place by the wind in the desert is called sand dunes.
(vi) How are beaches formed?
Answer - The sea waves deposit sediments along the shores which leads to the formation of beaches.
(vii) 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 which in some time cuts off from the river and forms a cut- off lake, called an ox-bow lake.
Tick the correct answer.
(i) Which is not an erosional feature of sea waves?
(a) Cliff (b) Beach (c) Sea cave
Answer - (b) Beach
(ii) The depositional feature of a glacier is:
(a) Flood plain (b) Beach (c) Moraine
Answer - (c) Moraine
(iii) Which is caused by the sudden movements of the earth?
(a) Volcano (b) Folding (c) Flood plain
Answer - (a) Volcano
(a) Volcano (b) Folding (c) Flood plain
Answer - (a) Volcano
(iv) Mushroom rocks are found in:
(a) Deserts (b) River valleys (c) Glaciers
Answer - (a) Deserts
(v) Ox bow lakes are found in:
(a) Glaciers (b) River valleys (c) Deserts
Answer - (b) River valleys
Match the following.
(i) Glacier (a) Sea shore
(ii) Meanders (b) Mushroom rock
(iii) Beach (c) River of ice
(iv) Sand dunes (d) Rivers
(iv) Sand dunes (d) Rivers
(v) Waterfall (e) Vibrations of earth
(vi) Earthquake (f) Sea cliff
(g) Hard bed rock
(h) Deserts
Answer -
(i) Glacier ---------(c) River of ice
(g) Hard bed rock
(h) Deserts
Answer -
(i) Glacier ---------(c) River of ice
(ii) Meanders -----(d) Rivers
(iii) Beach ---------(a) Sea shore
(iii) Beach ---------(a) Sea shore
(iv) Sand dunes ---(h) Deserts
(v) Waterfall -------(f) Sea cliff
(vi) Earthquake ----(e) Vibrations of earth
Give reasons.
(v) Waterfall -------(f) Sea cliff
(vi) Earthquake ----(e) Vibrations of earth
Give reasons.
(i) Some rocks have a shape of a mushroom.
Answer - In desert, wind is an active agent for erosion which erode the lower section of the rock more than the upper part. Therefore, some rocks have a shape of a mushroom having narrower base and wider top.
(ii) Flood plains are very fertile.
Answer - Flood plains are very fertile because floods deposit layers of fine soil and other material called sediments which is ideal for cultivation along its banks.
(iii) Sea caves are turned into stacks.
Answer - When cavities in sea caves become bigger and bigger only the roof of the caves remain forming sea arches. Further, erosion breaks the roof and only walls are left which forms the stacks.
(iv) Buildings collapse due to earthquakes.
Answer - During earthquakes, vibrations travel outwards from the epicentre as waves and propagate through the surface of the earth which produce sudden movements that leads to the collapse of buildings.
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