Earth is made mostly of metals and rocks. Where did this material come from?
A) It was produced in the Big Bang.
B) It was created by chemical reactions in interstellar space.
C) It was produced by nuclear fusion in stars.
D) It was made by our Sun.
E) It was made by nuclear fission of uranium and other radioactive materials.

Question

Quizplus · Accepted Answer

Earth's material is believed to have been produced by nuclear fusion in stars. The elements heavier than helium, such as carbon, oxygen, iron, and others, are formed in stars through nuclear reactions. When stars explode in supernovae, they eject these heavier elements into space, where they eventually form new stars and planets, including Earth.

Note: options A, B, D, E are incorrect as they either do not produce heavy elements or are not relevant to the formation of Earth's materials.

Earth Is Made Mostly of Metals and Rocks