3. Which of the following is evidence of a near-Earth supernova having occurred

ID: 232179 • Letter: 3

Question

Which of the following is evidence of a near-Earth supernova having occurred 2.8 million years ago?

Select one:

A. Cave paintings of the intensely bright event by early humans

B. Cosmic ray particles embedded in ancient ice cores

C. A spike in the abundance of radioactive iron in rocks of that age

D. The fossil record indicates a mass extinction, likely caused by gamma radiation poisoning

Where does gold (the element) come from?

Select one:

A. it was produced during the Big Bang

B. it is produced during the late stages of core fusion in red supergiant stars

C. it is produced during the supernova explosions of high-mass stars

D. it is produced by cosmic rays interacting with lead atoms in the Earth's crust

E. it is produced during the late stages of fusion in Sun-like stars

3. C. A spike in the abundance of radioactive iron in rocks of that age

4. C. it is produced during the supernova explosions of high-mass stars

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