How do most of the heavier elements up to iron form in the Universe?
A. in the cores of protostars
B. in supernova explosions
C. by nucleosynthesis in the cores of massive stars
D. in the original interstellar clouds
Answer: C
Environmental & Atmospheric Sciences
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A) A
B) B
C) C
D) D
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A) north pole B) south pole C) both A and B
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What percentage of the 25 key nonrenewable mineral resources must the US import?
A. All or nearly all B. Little to none C. 1/4 to 1/2 D. 1/2 to 3/4
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Answer the following statement true (T) or false (F)
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