Scientists believe that the earth's core is made mostly of: silicon and oxygen iron and nickel granite and basalt calcium carbonate

iron and nickel

Explanation:

According to the various researches conducted by numerous scientists, the core of the earth is made of "IRON and NICKEL." The Iron forms the inner most park, with a radius of about 750 miles thickness, while the Nickel-Iron alloy forms the outcome, with a radius of about 1,355 miles thickness.

Hence, in this case, the correct answer is " Scientists believe that the earth's core is made mostly of: IRON and NICKEL.

c or d both can be the answer

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).