Question

early earth with uniform composition
a chemically fractionated
earth
chemical
fractionation
(not drawn to scale)
which pair of elements sank to earths center during chemical fractionation?
a aluminum and silicon
b carbon and sulfur
c iron and nickel
d oxygen and potassium

Explanation:

Chemical fractionation is a process where elements separate based on their density. Heavier, more dense elements sink to the center. Iron and nickel are heavy metals that sank to Earth's core during chemical fractionation. Aluminum and silicon (A) are part of the crust (less dense). Carbon and sulfur (B) - carbon can be in various forms (not core - dominant), sulfur has compounds in different layers. Oxygen and potassium (D) - oxygen is in the crust (as oxides) and potassium is a lighter - metal - like element in the crust.

Answer:

C. iron and nickel