Question

Why are water bodies shown in blue and vegetation in green colour on map

Answer 1

hat's a relevant question. I suspect that is, in fact, due to vegetation being primarily green and water being primarily blue. Don't quote me though.

Answer 2

AS WATER IS OF BLUE COLOUR AND IT PPEARS BLUE IN THE EARTH, SO OCEANS AND WATER RECOURCES ARE OF BLUE COLOUR .......
SIMILARLY LAND HAS VEGETATION AND APPEARS GREEN FROM EARTH , SO APPEARS GREEN.....