FILL IN THE BLANKS : 1. Using ______ is d most common method of showing relief or elevation on toposheets 2. On referring to a grid ______ are always started first. 3. At present the population of the world stand at ______ billion. 4._____ factors refer to the motive for immigration. 5.The highest sex ratio in the world has been recorded as ______ pls ans fast it is very imp pls........
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1. contour lines
2. Longitude
3. 7.8billion
4. environmental or social
5. 2:87
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