Page 145 - SST Class 06
P. 145

3.  A ________________    is a portion of land that is more or less flat and level elevated above
                      the surrounding area.

                      (a)  mountain                     (b)  plateau                   (c)  plain
                  4.   ________________   of all the earth’s water is salty.
                      (a)  97%                          (b)  98%                       (c)  99%

                  5.   As we go higher, the air becomes ________________       and in space there is no air.
                      (a)  thinner                      (b)  thicker                   (c)  both (a) & (b)
                  6.  It always moves from high-pressure areas to low-pressure areas.

                      (a)  Wind                         (b)  Water                     (c)  Both (a) & (b)

             B.  Distinguish between the following. Use a tabular form.
                  1.  Physical environment and Biological environment  2.   Lithosphere and Hydrosphere

             C.  Give reasons for the following.
                  1.  We should protect the earth.
                  2.   Atmospheric pressure decreases with height.

                  3.   Oxygen is essential for life.
             D.  Write True or False.

                  1.  The earth is made up of  several unique properties, characteristics and compositions.
                  2.   Sia stands for silica and aluminum while sima stands for silica and magnesium.
                 3.   All the water in the hydrosphere is always not in motion just like the atmospheric gases.

                  4.   The atmosphere extends up to about 1,0000 km above the earth's surface.
                  5.   Life does not require cooperation for coexistence.

             E.  Answer the Following questions.
                  1.  Which are the two layers that form the crust of the earth?
                  2.  How many continents does the earth have?
                  3.  What percentage of the total air is found near the surface of the earth?

                  4.  What do you understand by the term ‘physical environment’?
                  5.  Which gases comprise the atmosphere?

             H    TS Question
             H    TS Question

             Which conditions, in the space, occurred due to which the earth is formed?

                                                     Activity
                                                     Activity
                                                     Activity & ProjectActivity & ProjectActivity & ProjectActivity      && ProjectProject   & Project
             A.  Collect news items/reports on the environment. Put it up in the class and let everyone read it.

             B.  Make  a  list  of  things  we  can  do  to  reduce  pollution  in  our  environment.  Make  a  good
                  beginning by starting an eco-club. Write down its aims. The website of the Energy and Resources
                  Institute (TERI), New Delhi gives many activities for eco-clubs. (www.edugreen.teri.res.in)

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