Class VII B Geography

                               The Indian Sub - Continent

Exercise G : Give reasons for :

Ans 1 : Due to tectonic plates movements the crust of the Tethyas Sea was compressed to form the      

            Himalayas  

         

Ans 2 : It is not only India that is under the sole control of the monsoon wind because the Himalayas form an 

            arc in the North cutting out all other climatic influences .

Ans 3 : River Ganga drains the melt water of the Himalayan snow because it rises from Gangotri glacier

           at a height of 6000 metres on the Himalayas . It also drains the Monsoon rain water of the Deccan            

           because Chambal and Betwa are the right bank tributaries of the  Yamuna .

Ans 4 : Many rivers rise from the Western Ghats and flow across to the east because the Deccan Plateau

                  from West to East cutting deep valleys making it a dissected plateau .

Ans 5 : The Rann of Kachchh is a salt marsh in Gujarat . During high tide , it is covered by a few metres

             of sea water . The sea water is then evaporated in salt pans .

Exercise I : Compare the following pairs (page no 139 )      

Ans 1 : Rocks of the Himalayas are Sedimentary rocks as rocks of the pleatean are Igneous and 

            Metamorphic  Rocks . 

Ans 2 : Nanga Parbat is the Western limit of the Himalayas in Jammu and Kashmir whereas Namcha Barwa 

           is the Western limits of the Himalayas north of Arunachal Pradesh in Chinese territory .

Ans 3 : Lake manasarover is a fresh water lake and lake Sambhar is salt water lake .

Ans 4 : Rann of Kachchh is salt marsh whereas Sunder bans is a tidal forest .

Ans 5 : Andaman and Nicobar are peaks of submarine whereas Lakhwadeep islands are coral in origin .