When jayden applies the hydrogen peroxide to Chloes dark hair, the melanin pigments in her hair will be

Chloe's hair will lose melanin pigment and turn a lighter color.

Explanation:

Hair bleach is made out of hydrogen peroxide, it is used to lighten hair color.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.