LSAT 127 – Section 2 – Question 08

LSAT 127 - Section 2 - Question 08

December 2003

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT127 S2 Q08
+LR
Weaken +Weak
Causal Reasoning +CausR
A
12%
159
B
6%
160
C
4%
160
D
75%
166
E
2%
155
140
151
163
 +Medium 146.61 +SubsectionMedium

This boulder is volcanic in origin and yet the rest of the rock in this area is sedimentary. Since this area was covered by southward-moving glaciers during the last ice age, this boulder was probably deposited here, hundreds of miles from its geological birthplace, by a glacier.

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.

A
Most boulders that have been moved by glaciers have not been moved more than 100 miles.
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.
B
The closest geological source of volcanic rock is 50 miles south of this boulder.
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.
C
The closest geological source of volcanic rock is 50 miles north of this boulder.
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.
D
There are no geological sources of volcanic rock north of this boulder.
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?
E
No other boulders of volcanic origin exist within 50 miles of this boulder.
Perhaps volcanic boulders are rare. This doesn’t shed light on the source of the volcanic boulder that we’re talking about.

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LSAT PrepTest 127 Explanations

Section 1 - Logical Reasoning

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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