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 the nuclear fusion in stars that made the heavy elements.
D)It was made by our Sun.
E)It was made by nuclear fission of uranium and other radioactive materials.

Question

Quizplus · Accepted Answer

The heavy elements that make up rocks and metals, such as iron and silicon, were produced by nuclear fusion in stars. When these stars went supernova, they expelled their enriched material into the interstellar medium which eventually formed into our solar system and the Earth.

(Note: A and B are incorrect as they do not explain the origin of heavy elements. D is incorrect as the Sun is a relatively low-mass star and did not produce most of the heavy elements. E may contribute to the amount of radioactive elements on Earth, but not the majority of its composition.)

Earth Is Made Mostly of Metals and Rocks