Geologists once thought that the molten rock known as lava : GMAT Sentence Correction (SC)
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# Geologists once thought that the molten rock known as lava

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Director
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Geologists once thought that the molten rock known as lava [#permalink]

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08 Jul 2007, 17:41
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Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes, but they now know that it is continuously created by the heat of the radioactivity deep inside the planet.

A. was an underground remnant of Earth's earliest days, sporadically erupting
B. had been an underground remnant of Earth's earliest days and sporadically erupted
C. was an underground remnant of Earth's earliest days, which sporadically erupted
D. would be an underground remnant of Earth's earliest days that sporadically erupted
E. was an underground remnant of Earth's earliest days, having sporadically erupted
If you have any questions
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09 Jul 2007, 13:58
trahul4 wrote:
Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes, but they now know that it is continuously created by the heat of the radioactivity deep inside the planet.

A. was an underground remnant of Earth's earliest days, sporadically erupting
B. had been an underground remnant of Earth's earliest days and sporadically erupted
C. was an underground remnant of Earth's earliest days, which sporadically erupted
D. would be an underground remnant of Earth's earliest days that sporadically erupted
E. was an underground remnant of Earth's earliest days, having sporadically erupted

A looks just fine.

B and D are out, because they all don't use correct tense.

Between A,C and E, A is the best choice with clear modifier.
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09 Jul 2007, 17:31
My vote goes to A also.

Geologists once thought lava was X, now it (lava) is Y.

Simple past, simple present.
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10 Jul 2007, 01:36
good job guys.. OA is A.
please explain what is wrong with E
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16 Jul 2007, 20:13
C does not have a good flow. This is not an instance in which ", which" is needed. Remember, when you use ", which" that means that the phrase can be omitted from the text and not affect the meaning of the sentence.
In this case, the phrase needs to stay in the sentence to help with flow.
That's my humble opinion.

As for E, the gerund phrase "having...erupted" may have some agreement issues, but IMHO it just didn't flow right.

This one was so tough to prove the original wrong, that I think the answer has to be A
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16 Jul 2007, 20:15
trahul4 wrote:
Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes, but they now know that it is continuously created by the heat of the radioactivity deep inside the planet.

A. was an underground remnant of Earth's earliest days, sporadically erupting
B. had been an underground remnant of Earth's earliest days and sporadically erupted
C. was an underground remnant of Earth's earliest days, which sporadically erupted
D. would be an underground remnant of Earth's earliest days that sporadically erupted
E. was an underground remnant of Earth's earliest days, having sporadically erupted

A for me.
D "would be" is not right.
C wrong modifier
D wrong modifier
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17 Jul 2007, 12:26
trahul4 wrote:
Geologists once thought that the molten rock known as lava was an underground remnant of Earth's earliest days, sporadically erupting through volcanoes, but they now know that it is continuously created by the heat of the radioactivity deep inside the planet.

A. was an underground remnant of Earth's earliest days, sporadically erupting
B. had been an underground remnant of Earth's earliest days and sporadically erupted
C. was an underground remnant of Earth's earliest days, which sporadically erupted
D. would be an underground remnant of Earth's earliest days that sporadically erupted
E. was an underground remnant of Earth's earliest days, having sporadically erupted

why doesnt sproadically erupting modify underground remnants?
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17 Jul 2007, 15:19
Good explanation by simonsanchez. Thanks.
I was confused between A and C.
Now convinced abt A.
17 Jul 2007, 15:19
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