Maps do not have to be in color but color helps make interpretation easier.
An orthophosphate map is black and white while the toptgraphical map is in colour.
A relief map is a map designed to show land that isn't flat. It does so by showing various lines and colours to indicate height.
all the colors
It is a term used in height. On a map they use a variety of colours to show this. The colours do not stay the same. In fact, they get darker. e.g. green, yellow, orange, brown
a Map key is important because it helps you understand a symbol, label, or explanation. (thanks for supporting my answer please leave comment if you like it or not!:-)
It is a map that indicates temperatures in an area by using different colours and a key to indicate the temperatures the colours represent.
Mainly different colours.
It uses different colours, with a legend telling you which colours represent which height.
cartogram
blah blah blah
Blue - water Green - vegetationWhite - non-forested areaRed - land grid and important roadsBlack - small roads/trails, railways, boundaries etc
An orthophosphate map is black and white while the toptgraphical map is in colour.
Economic activity can be represented on a map by using various colours.
A relief map is a map designed to show land that isn't flat. It does so by showing various lines and colours to indicate height.
all the colors
A legend describes the meaning of lines, symbols and colours used on the map.
Countries on a map are usually different colours and National borderlines are always indicated.