Jess scratches an unknown mineral with topaz, which has a Mohs hardness of 8. Topaz leaves a scratch on the unknown mineral. The unknown mineral
has a Mohs hardness of 10
is harder than diamond
Is harder than topaz
Dis softer than diamond
is softer than topaz

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.