Why do we think the inner (terrestrial) planets became denser than the outer planets?
a. As the solar nebula collapsed, gravity pulled denser materials toward the center.
b. The inner part of the solar nebula was so hot that only dense metals and rocks were able to condense there.
c. The rotating disk in which the planets formed flung lighter elements outward by rapid rotation.
Answer: b. The inner part of the solar nebula was so hot that only dense metals and rocks were able to condense there.
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What will be an ideal response?