CBSE Class 7 Social Science How Surface Landforms Change Assignment Set B

Q. 1 Give suitable term to the following:

i) Different sections of the river.

ii) The river’s most important action in the upper course.

iii) The valley which becomes deep and narrow, with steep, wall-like sides after being eroded by the river.

iv) These are called large gorges.

v) One feature formed when the river descends from a higher-level to a lower-level.

vi) Sediments deposited by river.

vii) The bow-shaped lake.

Q.2 Fill in the blanks.

i) The combined action of all processes that involve only the breaking down of rocks is known as _________.

ii) The combined action of transportation and breaking down of rocks is known as ___________.

iii) The region near a river’s mouth comprising a network of distributaries is called a ____________.

iv) A lake of sea water separated from the main body of the sea by deposits accumulated on the sea bed is called a ___________.

v) _________ is an organic substance derived from partly decomposed plant and animal remains in the soil.

vi) __________ falls in Venezuela are the world’s largest falls.

vii) The Grand Canyon in the USA has been carved by the rivers _________.

Q.3 Name any three types of landforms formed by a river in

i) Upper course - ______________, _____________, _____________

ii) Middle course- ______________, _____________, _____________

iii) Lower course- ______________, _____________, _____________

Q.4 Match the two columns-

                A                                                                    B

i) Estuaries                                               a) Beaches and lagoons

ii) Glaciers                                                b) do not involve transportation

iii) Wind                                                   c) Mushroom rocks, sand dunes

iv) Weathering, Erosion, Mass movement    d) Denudation

v) Weathering                                           e) Moraines

vi) Chilika                                                 f) Humus

vii) Soil                                                    g) Largest lagoon (Orissa)

Q.5 Define the following terms-

a) Erosion

b) Flood plain

c) Marine erosion

d) Weathering

e) Delta

f) Lagoon

g) Oasis

Q. 6 Name and label the following diagrams.

Q.7 Draw the different sections of a River’s Course and label its features.

Q.8 Answer the following questions.

i) What are the factors that influence the rates of weathering and erosion?

ii) Describe the formation of a delta.

iii) How can we conserve soil?

iv) Differentiate between weathering and erosion.

v) What are the functions performed by a river?

Q.9 Give reasons.

i) In an estuary no delta is formed.

ii) The action of wind is more prominent in dry regions.

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