(this is a music question but there is no music subject option) which is an example of a ternary form 1. a b a c a 2. a b a c a b a 3. a b a 4. a b c

option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).