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

 Q. (4) – Write the scientific term for each of the following:

1-They are deep valleys covered by flowing water.            (………………..………)
2-The condition of atmosphere at a specific time and place.  (…………………….…)

3-Process in which small broken rocks move from a place to another by the help of wind

or water.                                                    (…………………..…....)

4-A process in which the colors of paints of houses are changed as a result of falling of

acid rains.                                                  (……………………..….)

5-A fan-shaped (triangular) mass of sediment that is formed where a river enters a larger

body of water like seas.                                     (….…….……..………..)

Q. (5) – Give reason for:

   1-Iron in rocks may rust.
   …………………………………………………………………………………..………
   2-Water play an important role in the formation of limestone caves.
   ……………………………………………………………………………………….…..

Q. (6) – What happens when:

   1-Lichens growing on rocks produce acids.
   ……………………………………………………………………….…………………..
   2-A river carries sediments meet a sea.
   …………………………………………………………………………………..……….

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