Which of the following lists the composition of the earth’s outer core?
a. calcium, potassium
b. silicon, aluminum, calcium, sodium and potassium
c. iron, nickel
d. oxygen, magnesium, iron, aluminum, and calcium

Well,

The outer core of the Earth is mostly composed of iron and nickel.

The correct option is C.

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.