In what way can composition structures help you create your artwork?

The elements of composition in art are used to arrange or organize the visual components in a way that is pleasing to the artist and, one hopes, the viewer. They help give structure to the layout of the painting and the way the subject is presented.

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).