location.
they are natural features that are shown in a map
Different kinds of maps are created for different purposes. To navigate from one place to another, one would prefer a physical (geographic) map, but to locate a country, one would need a political map and a world map is for the world. Further refinements include road maps, topographic maps, nautical and aeronautical charts, each of which represent more physical details. Thematic maps can be used to display distribution of various measurements, such as people, oil, cellphone coverage, etc.
The M 21 can refer to many things. If you mean the Manhattan Bus Map 21, you can find this at "Manhattan Transit Authority". The Nevada Bureau of mines has a map M 21. If you are referring to "Dragon Age: Origins", M 21 Ostaga, a website called Game Pressure would be the right place for you.
Keys
A map key looks like a map with keys on it !
a line
they are natural features that are shown in a map
Land forms
To find out where things are on a map.
Go to the map and find it there.
a circular dot on a map could mean a variety of things. Most likely the dot would indicate a city. Check the legend of your map to find out.
You would look at the scale on the map.
You would find it in the map key or legend
Yes. I would use a map. Maps are very handy. You can see many things on a map; Parks,highways,hotels,restaurants,and many other places.
A world map.
On the compos on the map.
a map that is information