Astronomy quiz question: sun as source of Earth elements and core heat?

Astronomy 210 Quiz 7, spring semester 2017
Cuesta College, San Luis Obispo, CA

Fusion reactions in the sun's core produced the:
(A) heat inside Earth's core.
(B) lithium in car batteries.
(C) iron in your blood.
(D) gold and silver in Earth's crust.
(E) (More than one of the above choices.)
(F) (None of the above choices.)

Correct answer (highlight to unhide): (F)

Stars produce metals (elements heavier than hydrogen and helium) in their cores during their giant/supergiant phases, up through type Ia/II supernovae explosions. Along with their unused hydrogen, these metals are then scattered into the interstellar medium, which are then incorporated into later generations of stars (or planets). Since all of elements listed above (lithium, iron, gold and silver) and core heat comprise Earth today, they cannot be elements nor energy produced by the sun within its core, as both sun and Earth formed from the same gas/dust cloud at the same time.

Section 30674
Exam code: quiz07N4rR
(A) : 3 students
(B) : 0 students
(C) : 2 students
(D) : 1 student
(E) : 7 students
(F) : 6 students

Success level: 34% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.40

Section 30676
Exam code: quiz07Sl1M
(A) : 7 students
(B) : 1 student
(C) : 1 student
(D) : 6 students
(E) : 16 students
(F) : 9 students

Success level: 26% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.42

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