The color brown for high mountains
If I were shading a map of Illinois, I would use a light blue color. This choice would represent the state's numerous lakes and rivers, such as Lake Michigan and the Illinois River, while also providing a visually appealing contrast to neighboring states. Additionally, light blue is often associated with tranquility and can enhance the overall readability of the map.
it is the legend
A choropleth map is a type of map that uses different shading or color intensities to represent different quantities or values within geographic areas.
Assuming the blue shading is denoting areas of water then fish would be a good guess.
Assuming the blue shading is denoting areas of water then fish would be a good guess.
It is a shaded relief map.
The blue shading on a map usually represent an area or body of water. Aquatic animals normally live in these areas on the map.
Political system distribution
layer shading on an OS map, is shown by using different colors to represent height on the map. Usually darker the color the taller the piece of land is. Although you could use different colors for E.G blue could could show that the land is high and green could show very low land.
A contour map.
A contour map.