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Geologists once thought that the molten rock known as lava

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Senior Manager
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Geologists once thought that the molten rock known as lava [#permalink] New post 27 Jun 2007, 20:35
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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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 [#permalink] New post 27 Jun 2007, 21:29
Confused between the use of Would and Was here ?? Explanations please.
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 [#permalink] New post 27 Jun 2007, 21:31
A for correct switch from Simple past to present.
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Re: SC: Geology [#permalink] New post 27 Jun 2007, 21:56
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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Re: SC: Geology [#permalink] New post 28 Jun 2007, 03:07
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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Re: SC: Geology [#permalink] New post 10 Aug 2010, 06:52
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....
Re: SC: Geology   [#permalink] 10 Aug 2010, 06:52
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Geologists once thought that the molten rock known as lava

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