Io experiences tidal heating primarily because a) it is located very close to jupiter. b) it is made of relatively soft materials that deform quite easily. c) it has an elongated shape that makes it look more like an egg than a sphere. d) its elliptical orbit causes the tidal force to vary as io orbits jupiter.

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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 .