PT132.S3.P2.Q12

PrepTest 132 - Section 3 - Passage 2 - Question 12

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P1

A vigorous debate in astronomy centers on an epoch in planetary history that was first identified by analysis of rock samples obtained in lunar missions. ██████████ ██████████ ████ ███ █████ ███████ ██ ███ ████ ████ ███████ ██ █ ████████ ███████████ ██ ██████ █████████████ ████ ███████ █████ █████████ █████████ ████ █████ ███████████ ██████ ███████████ ████ ████ ███████████ ████ ████████ ███ ████ ██████ ████ ████ ██████ ██████ █ ██████████ ████ ████████ ████████████ ███ ███ ███████ ██ █████ ██████ █████ ███ ███ ██████ ████ █████ ███ ████ ████████ █████

Phenomenon · Late heavy bombardment
4 billion years ago, Moon and Earth were both massively bombarded with projectiles.
P2

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Hypothesis 1 · Large asteroid or comet disintegration
Evidence: size of lunar craters is large, suggests a large asteroid or comet broke apart and bombarded inner solar system with debris.
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Hypothesis 2 · "LHB" is just a part of an even longer period of bombardment
"LHB" is part of a continuous bombardment that lasted billions of years. "LHB" just happened to be last and hence obliterated evidence of earlier impacts.
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Hypothesis 3 · LHB only affected Earth-Moon system
Contra hypothesis 1 which claims that LHB affected entire inner solar system (Mars, Earth, Venus, and Mercury).
P3

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Evidence Supporting Hypothesis 1 · Mars rock found on Earth
Mars rock dates to same time as LHB, suggesting that Mars experienced bombardment too
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Conclusion · LHB wasn't just an Earth-Moon phenomenon
At least Mars experienced it too.
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Further Research · To decide between the different hypotheses
Passage Style
Critique or debate
Phenomenon-hypothesis (RC)
Show answer
12.

According to the passage, the █████ █████ ██ ██████████ ███████████████ ████████ ██ ███ ██████ ██████████ ████████ ████ ███ ███

a

affected only the ████

Unsupported. We see in the last sentence of P2 that these scientists think that the LHB was limited to the Earth-Moon system, not just the Moon itself.

2%
b

was so brief ████ ███ ██████ ███ ██ ██ ██████ █████████

This is stated in P2.

88%
c

consisted of so ██████ ██████ ████ ██ ███ ████████ ███████ ██ ███ ███████ ██ ███ █████ █████ ██████

Unsupported. According to these scientists, the cataclysm did not extend through the inner solar system, so there’s no reason to believe that the debris would have been absorbed by the inner solar system planets.

5%
d

occurred more recently ████ ████ ███████ █████ ███

Unsupported. The discussion of the scientists who support Hypothesis 3 does not indicate that these scientists disagree with the pre-established time frame of four billion years ago that was given in P1.

1%
e

may have lasted █ ████ █████ ███ ███ ███ ██████ ████████ ██████ ███ ██████████ ██████

Anti-supported. According to Hypothesis 3, the LHB was brief.

4%

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