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Delta Modern Language School
Grade 4
Date ......./......./………

Exercises on Unit (4) concept (1)

Q. (1) – Complete the following sentences: -

1-Breaking a statue is an example of …………………. weathering, while rusting of an
iron statue is an example of……….... weathering.
2-Cracks caused by freezing of water and melting of ice represent …………. weathering.
3-Sand grains……………. on the ground when the wind carrying its stops.
4-When strong ……….…. blow in the desert, large sand dunes are formed.
5-Wind, ...........…and gravity are natural factors that control erosion process.

Q. (2) – Put (√) in the front of the right statement and (×) in the front of

the wrong one: -

1-The surface of earth changes from time to time. ()

2-All physical factors of mechanical weathering lead to breaking down of rocks. ( )

3-Limestone caves are formed as a result of chemical weathering. ()

4-Sea waves may cause erosion of beaches. ()

5-Deposition process never change the shape of the land. ()

Q. (3) – Choose the correct answer:

1-The formation of canyons takes…………

a-few minutes. b-few hours. c-few days. d-many years.

2-Which of the following does not cause mechanical weathering?.......

a-roots of plants. b-Acid rains. c-Wind movement. d-Water movement.

3-Lichens produce …………...on rocks that dissolve minerals found in these rocks.

a-oxygen. b-acids. c-water. d-rain.

4-Moving of sediments from a place to another represents………process.

a-weathering. b-photosynthesis. c-erosion. d-deposition.

5-When a river meets a sea or an ocean, a ……….is formed.

a-canyon. b-volcano. c-mountain. d-delta.

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