PrepTest 127 - Section 2 - Question 8 | Explanation & Discussion

SECTION 1 · lr

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22 Question 23 Question 24 Question 25 Question 26

SECTION 2 · lr

SECTION 3 · lr

SECTION 4 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

PASSAGE 2

Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15

PASSAGE 3

Question 16 Question 17 Question 18 Question 19 Question 20 Question 21

PASSAGE 4

Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

Summarize Argument: Phenomenon-Hypothesis

The author hypothesizes that the boulder was probably deposited in its location by a glacier. This is based on the fact that the boulder is volcanic, but the surrounding rock is sedimentary. In addition, we know the area had southward-moving glaciers during the last ice age.

Notable Assumptions

The author assumes that there’s no other more likely source of the boulder besides the glaciers that were moving southward during the last ice age.

Even if most boulders moved by glaciers didn’t travel as far as this one did, that doesn’t undermine the support provided by the specific reasons offered for why this boulder was moved by glaciers. Most other boulders might not be volcanic within sedimentary rock.

Illusory inconsistency

We have no reason to think the boulder must have come from the closest source. Maybe there’s a source north of the boulder that’s several hundred miles away, and the boulder was carried south by a glacier.

Unwarranted assumption

We have no reason to think the boulder must have come from the closest source. Maybe there’s a source north of the boulder that’s several hundred miles away, and the boulder came from that source.

Unwarranted assumption

This makes the author’s hypothesis less plausible. If there are no geological sources of volcanic rock north of the boulder, it’s difficult to explain how a southward-moving glacier could have deposited the boulder in its current location. Where would the boulder have come from?

Plausibility

Perhaps volcanic boulders are rare. This doesn’t shed light on the source of the volcanic boulder that we’re talking about.

PrepTest 127 - Section 2 - Question 8

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