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# Geologists once thought that the molten rock known as lava

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Senior Manager
Joined: 21 Jun 2006
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Geologists once thought that the molten rock known as lava [#permalink]

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27 Jun 2007, 21:35
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0% (00:00) correct 100% (00:37) wrong based on 9 sessions

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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.
1. was an underground remnant of Earth's earliest days, sporadically erupting
2. had been an underground remnant of Earth's earliest days and sporadically erupted
3. was an underground remnant of Earth's earliest days, which sporadically erupted
4. would be an underground remnant of Earth's earliest days that sporadically erupted
5. was an underground remnant of Earth's earliest days, having sporadically erupted

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Manager
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27 Jun 2007, 22:29
Confused between the use of Would and Was here ?? Explanations please.

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VP
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27 Jun 2007, 22:31
A for correct switch from Simple past to present.
_________________

Trying hard to conquer Quant.

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Senior Manager
Joined: 11 May 2004
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27 Jun 2007, 22:56
ArvGMAT 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.
1. was an underground remnant of Earth's earliest days, sporadically erupting
2. had been an underground remnant of Earth's earliest days and sporadically erupted
3. was an underground remnant of Earth's earliest days, which sporadically erupted
4. would be an underground remnant of Earth's earliest days that sporadically erupted
5. was an underground remnant of Earth's earliest days, having sporadically erupted

'was' required for logical switch between simple past and present tense.

1,3,5 - left

3 - 'which' points earths earliest days - out

1, 5 - hard choice.

Selected 1.

But, what is wrong with 5??

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Manager
Joined: 26 Oct 2006
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Location: uk

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28 Jun 2007, 04:07
syamee_u wrote:
ArvGMAT 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.
1. was an underground remnant of Earth's earliest days, sporadically erupting
2. had been an underground remnant of Earth's earliest days and sporadically erupted
3. was an underground remnant of Earth's earliest days, which sporadically erupted
4. would be an underground remnant of Earth's earliest days that sporadically erupted
5. was an underground remnant of Earth's earliest days, having sporadically erupted

'was' required for logical switch between simple past and present tense.

1,3,5 - left

3 - 'which' points earths earliest days - out

1, 5 - hard choice.

Selected 1.

But, what is wrong with 5??

1 for me too.
5 says " having sporadically erupted" which is past tense while we require present.

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Senior Manager
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10 Aug 2010, 07:52
mgmat-700-level-sc-66657.html?hilit=geologist#p496641

OA is A .. key point is Adverbual modifier can be placed anywhere in the sentence and should not necesarily touch the noun ...
I marked A by POE....

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Re: SC: Geology   [#permalink] 10 Aug 2010, 07:52
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# Geologists once thought that the molten rock known as lava

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