المساعد الشخصي الرقمي

مشاهدة النسخة كاملة : theme 5: how weather changes,science 5



شوقية
15-03-2010, 05:57 PM
1-what causes the wind to blow?


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2-what causes land and sea breezes?


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3- What causes rain-the water cycle?


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4- Process of water cycle:


--------------------------------------------------------------------------------------------------------5-process of rain:


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6- What causes the seasons?


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7- what causes of weather changes ?


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8-put /for true and x for false, give reason.


a) Weather changes are mainly caused by the heat of the sun. ( )


Reason: --------------------------------------------------------------------------------------------


b) Hot air is heavier than cold air. ( )


Reason: --------------------------------------------------------------------------------------------


c) When clouds are formed close to the ground they are called fog. ( )


Reason: --------------------------------------------------------------------------------------------


d) Dew drops come from clouds. ( )


Reason: --------------------------------------------------------------------------------------------


e) Seasons happen because of the revolution of the earth. ( )


Reason: --------------------------------------------------------------------------------------------


9-name these:


a) Cooling of water vapour to form water ------------------------


b) It forms on plants in cold nights----------------------------------


c) Farmers do not like it because it harms their crops------------------------------


d) The sweat cannot evaporate quickly in this weather----------------------------


10-how does the heat of the sun cause the wind to blow?


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11-why does not fog form in summer ?


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12-why do you feel very uncomfortable in hot and humid weather?


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13- Complete:


1) The weather may be hot, ------------, --------------, --------------or-----------------


2) The weather changes and the wind moves because of -------------------------


3) -----------------------is the moving of the air from the sea to the land .it happens at day time.


4) -----------------------is the moving of the air from the land to the sea. It happens at night.


5) ----------happens in three steps: evaporation, condensation and precipitation


6) ------------------------water turns into steam by the sun.


7) ------------------------high in the sky the steam changes into water again.


8) ------------------------tiny drops of water join together and fall to the ground.


9) Forms of precipitation-----------, ------------------, -------------, ---------------,-- ---


10) -------------------liquid water falls to the ground.


11) ----------------------------------when it is very cold water vapor freezes and falls to the ground.


12) --------in cold nights water vapor condenses to form drops of water on plants.


13) ---------------is frozen dew.


14) ---------------in winter when the air near the ground is cold water vapor condenses to form clouds near the ground.


15) -------------------------we feel it when there is a lot of water vapor in air.


16) We feel -------------because our sweat cannot evaporate quickly.


14- Complete the table:


meaning


word


meaning


word






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