Page 94 - full

E XE R C I S E

A. Circle the correct answer.
1. Sea breeze occurs during day time/night.
2. The strongly moving air is called wind/storm.
3. In condensation/evaporation water changes to water vapours.
4. Revolution/Rotation of the earth causes change in seasons.

B. Fill in the blanks.
1. The moving air is called _______________ .
2. Clouds, dew and fog are examples of _______________.
3. The part of earth closer to the sun has _______________days.
4. Sedimentation is used to remove _______________.
5. We can clean water by adding _______________ tablets.

C. Give one word answer.
1. How much percent of oxygen is present in air?
____________________________________________________________
2. What is the gentally moving air called?
____________________________________________________________
3. Name the process of change of water into water vapour.
____________________________________________________________
4. Name the process used to purify water containing insoluble impurities.
____________________________________________________________
5. Give an example of condensation.
____________________________________________________________

\D. Answer the following questions.
1. What is air?
____________________________________________________________

98