In design, which principle is in effect when all elements in a design are in harmony and produce an undivided impact?
a.) balanceb. ) proportionc.) rhythmd. )unity

are do fireworks on the free way is safe ?

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).