It doesn't mean grassland. Green on a topographic map means there is enough cover to hide a tank. It was developed in one of the world wars I think.
Brown on a map usually represents areas of higher elevation, such as mountains or hills, rather than grassland or desert. Grassland is typically depicted in shades of light green, while desert areas are usually shown in shades of beige or light brown.
Brown usually means desert.
Brown usually means desert.
green
forests
land.Green on a map usually means land.
green areas are usually plains, while brown/yellow may be more mountainous
green areas are usually plains, while brown/yellow may be more mountainous
depends on the map maker who usually decides what's what; but normaly darker colors on a map mean higher temperatures / heavier rains / stronger winds etcetera.
forests
green
Green usually represents land unless your thinking about Golf courses. if it did mean water it proprably be seaweed