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End of the Triassic - cause and effect IR question

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Manager
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Joined: 12 Nov 2016
Posts: 136
Concentration: Entrepreneurship, Finance
GMAT 1: 620 Q36 V39
GMAT 2: 650 Q47 V33
End of the Triassic - cause and effect IR question [#permalink]

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New post 11 Nov 2017, 22:46
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Journalist: The end of the Triassic, the geologic period that extended from about 250 to 200 million years ago, has traditionally been blamed on volcanic eruptions that went on for 600,000 years. However, a researcher has recently suggested that these eruptions were only an indirect cause. By analyzing the isotopic composition of hydrocarbon molecules from plant waxes from the period, he discovered what looks like a spike in the amount of nonbiological carbon in the atmosphere, lasting between 10,000 and 20,000 years. The researcher believes that the release of methane—a carbon-containing greenhouse gas much stronger than carbon dioxide—stored at the bottom of the ocean was the direct cause of the end of the Triassic.

The journalist suggests that a certain causal sequence may have brought about the end of the Triassic period. Identify in the table the sequence of cause and effect most strongly suggested by the journalist to have resulted in the end of the Triassic. Make only two selections, one in each column.

Cause Effect
The emissions of volcanoes into the atmosphere


The extinction of many oceanic biological species


The eruption of volcanoes


The release of carbon dioxide into the atmosphere


The release of methane from the bottom of the ocean
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Re: End of the Triassic - cause and effect IR question [#permalink]

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New post 18 Jan 2018, 01:23
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I would go for:

Cause
The eruption of volcanoes

Effect
The release of methane from the bottom of the ocean
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Re: End of the Triassic - cause and effect IR question [#permalink]

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New post 20 Jan 2018, 23:18
Erjan_S wrote:
Journalist: The end of the Triassic, the geologic period that extended from about 250 to 200 million years ago, has traditionally been blamed on volcanic eruptions that went on for 600,000 years. However, a researcher has recently suggested that these eruptions were only an indirect cause. By analyzing the isotopic composition of hydrocarbon molecules from plant waxes from the period, he discovered what looks like a spike in the amount of nonbiological carbon in the atmosphere, lasting between 10,000 and 20,000 years. The researcher believes that the release of methane—a carbon-containing greenhouse gas much stronger than carbon dioxide—stored at the bottom of the ocean was the direct cause of the end of the Triassic.

The journalist suggests that a certain causal sequence may have brought about the end of the Triassic period. Identify in the table the sequence of cause and effect most strongly suggested by the journalist to have resulted in the end of the Triassic. Make only two selections, one in each column.

Cause Effect
The emissions of volcanoes into the atmosphere


The extinction of many oceanic biological species


The eruption of volcanoes


The release of carbon dioxide into the atmosphere


The release of methane from the bottom of the ocean



IMO, cause : The release of methane from the bottom of the ocean
effect : The reelase of carbon dioxide into the atmostphere

A.The emissions of volcanoes into the atmosphere
-> The journalist argues that emissons of volcanoes are indirect reason.
B.The extinction of many oceanic biological species
-> Not mentioned
C.The eruption of volcanoes
-> Same as A
D.The release of carbon dioxide into the atmosphere
-> The journalist argues that there was 'the amount of nonbiological carbon in the atmosphere'.
So it would be effect.
E.The release of methane from the bottom of the ocean
-> The journalist argues that the release of methan is direct cause. So cause is E

I am not sure this is correct. If not, is there anyone who can let me know what is correct?
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Re: End of the Triassic - cause and effect IR question [#permalink]

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New post 28 Jan 2018, 22:35
HG0815 wrote:
Erjan_S wrote:
Journalist: The end of the Triassic, the geologic period that extended from about 250 to 200 million years ago, has traditionally been blamed on volcanic eruptions that went on for 600,000 years. However, a researcher has recently suggested that these eruptions were only an indirect cause. By analyzing the isotopic composition of hydrocarbon molecules from plant waxes from the period, he discovered what looks like a spike in the amount of nonbiological carbon in the atmosphere, lasting between 10,000 and 20,000 years. The researcher believes that the release of methane—a carbon-containing greenhouse gas much stronger than carbon dioxide—stored at the bottom of the ocean was the direct cause of the end of the Triassic.

The journalist suggests that a certain causal sequence may have brought about the end of the Triassic period. Identify in the table the sequence of cause and effect most strongly suggested by the journalist to have resulted in the end of the Triassic. Make only two selections, one in each column.

Cause Effect
The emissions of volcanoes into the atmosphere


The extinction of many oceanic biological species


The eruption of volcanoes


The release of carbon dioxide into the atmosphere


The release of methane from the bottom of the ocean



IMO, cause : The release of methane from the bottom of the ocean
effect : The reelase of carbon dioxide into the atmostphere

A.The emissions of volcanoes into the atmosphere
-> The journalist argues that emissons of volcanoes are indirect reason.
B.The extinction of many oceanic biological species
-> Not mentioned
C.The eruption of volcanoes
-> Same as A
D.The release of carbon dioxide into the atmosphere
-> The journalist argues that there was 'the amount of nonbiological carbon in the atmosphere'.
So it would be effect.
E.The release of methane from the bottom of the ocean
-> The journalist argues that the release of methan is direct cause. So cause is E

I am not sure this is correct. If not, is there anyone who can let me know what is correct?


The gas discussed is methane not carbondioxide.
Re: End of the Triassic - cause and effect IR question   [#permalink] 28 Jan 2018, 22:35
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End of the Triassic - cause and effect IR question

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