What do you put on a map key?
you put the penis in the vagina nd moan
A key is something that explains the map. For example, if you see a small triangle on a map, the key will tell you that it means a mountain. If you are working with a physical map, then the key will tell you what all the colors mean. It is basically something that tells you what things on the map mean.
Yes, always put mountains on your map key, while your teacher may infer that the are mountains by looking at where they are and what they look like, she doesn't know for sure and could possibly take off points on the assignment. For all the teacher knows, those things they thought were mountains, may very well be a herd of chickens. ;)