​​GIVE REASONS
(d) In railway tracks a gap is left between the rails.
(e) Silver is not used in making utensils though it is the best conductor of heat.
(f) Soil erosion is less in dense forests as compared to barren open field.

Dear student, 
Please find below the links to the asked query        

d. https://www.meritnation.com/ask-answer/question/why-are-gaps-left-between-lengths-of-railway-tracks/heat/10371575

f. https://www.meritnation.com/ask-answer/question/why-is-soil-erosion-relatively-less-in-dense-forest-as-compa/soil/10969093

Please post remaining parts in separate thread.

Regards                                                                   
 

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