Earth is made mostly of metals and rocks. Where did this material ...

[tth]

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 2

Process of Science: How do we know what is going on in the center of the Sun so well if we cannot see it or send spacecraft to it?
 
  What will be an ideal response?

[Brummell1998]

Answer to Question 1

C

Answer to Question 2

We can apply our knowledge of how gases behave at different temperatures and densities, which is testable in laboratory environments, to make a mathematical model of the Sun. These models make predictions about how bright and how big the Sun is, which we can then compare with observations. We also use observations of vibrations on the Sun to learn about its interior structure in much the same way we use seismic testing on Earth. Finally, we can test our knowledge of nuclear physics and the fusion process in the core using observations of solar neutrinos.

[tth]

Thanks for the timely response, appreciate it

[matt95]

Great answer, keep it coming