Answer :

a) LPG is a fossil fuel whereas biogas is a man made fuel. So the blank can be filled by ‘fossil’.

b) Water; Glaciers are dense ice and hence a source of water.


c) Biodiversity; Forests and wildlife constitute the biodiversity.


d) Water; Khadin is among the ancient water harvesting structures which was specifically used in Rajasthan.


e) Carbon dioxide; It is produced when a fuel is burned in insufficient supply of air.


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