Question

why are water bodies shown in blue colour and lowlands in green on map

Answer 1

Answer:

To separate them in the map and the original of water and vegetation is generally blue and green. It can also because the real colour of water is blue and vegetation is generally green in colour.

Answer 2

Water bodies shown in blue colour and lowlands in green on map, so as to separate them in the map.

EXPLANATION:

Water bodies shown in blue colour and lowlands in green on map, so as to separate them in the map and also, the original colour of water and vegetation is generally blue and green respectively. Moreover, because that is how they look in pictures from outer space or from an aerial view