What did you find out that you might not learn anywhere else from this map?

What do i have to choose from? what are the answer choices? .

The "highest" point is a single point. 
there can't be more than one "highest" point.
it's not possible for every point on a line to be the "highest" one.

1)    "way light reflects from a mineral" —  luster ;

2)  "way a mineral breaks under stress " — cleavage ;

3)  "reveals true, natural color of a mineral
                (note: when in powdered form) — streak ;

4)  "least reliable property for identification" — color ;

5)    "measured using the mohs scale" —  hardness .