PrepTest 106 - Section 4 - Passage 2 - Question 13

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Long after the lava has cooled, the effects of a major volcanic eruption may linger on. ██ ███ ██████████ █ ████ ██ ████ ████ ███ ████████ ████ ████████ ███ ██████ ██████ ███ █████ ███ ███████ ███ ██████ ███████████ ████ █████████ ███████ ████ ████ ████ ███ █████ ██████ ████████ ██ ████ █ ████████ █████████ ██ ███████ ████████ ███

Researcher's perspective · Effects of a major volcanic eruption can chill Earth by blocking sunlight

Researcher's example · Tambora volcano eruption in 1815

Some think this caused colder weather in parts of North American the next year.

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Mass and Portman (M and P) perspective · Volcano effect on climate not as strong as previously believed

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Complicating factor · El Nino can magnify the apparent cooling effect of a volcano

El Nino causes temporary warming, which fades away. If eruption happens during warming, that might hide the actual effect of the volcano. But, if eruption happens while El Nino warming is fading away, that makes effect of eruption seem larger than it is.

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Correcting for complicating factor · Show volcanos don't cause as much cooling as previously thought

After M and P subtracted effect of El Nino, found (1) minor eruptions have no discernible effect on temperature; (2) major eruptions cause smaller drop than expected in hemisphere of the eruption, and an even smaller drop in the other hemisphere.

Other researchers' perspective · Climatic feedback loops can make small cooling effect turn into larger one

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Climatic feedback loop · Small temperature drop leads to causal chain of effects that could lead to major cooling in a region

Delayed melting of snow leads to more sunlight reflected, which affect jet stream...at this point I'm not focusing too much on the details. We can come back to this paragraph if we're asked about the climatic feedback loop.

Passage Style

Critique or debate

Phenomenon-hypothesis (RC)

13.

The primary purpose of the ████ █████████ ██ ███ ███████ ██ ██

Question Type

Purpose of paragraph

Structure

Rely on your low-res summaries to help you answer this question. In P2 and P3, the author presents evidence that volcanic eruptions probably didn’t cause unusually cool summers, at least, directly. But in P4, the author presents an argument by some researchers that supports the possibility that volcanic eruptions could have caused unusually cool summers indirectly. Let’s look for an answer related to showing how volcanic eruptions might cause cool summers indirectly through a feedback loop.

describe how the █████ ███████ █ ███████ ███████ ████ █████ ████████ ██ ████████ ████████ █████

P4 doesn’t involve a contrast between feedback loops and the “year without a summer.” Rather, P4 involves an argument that feedback loops might lead to a “year without a summer.”

account for the ██████████ ██████ ███████████ ███████ ██████ ██ █ █████ ████████ ████████

In P4, the author presents a theory about how a small cooling effect might lead to a larger one. This doesn’t help explain (account) why a volcanic eruption produces only a small hemispheric cooling effect.

explain how regional ████████ ██████████ ███ ██ █████████████ ████████ ██ █ █████ ████ ██ ███████████

This is the best answer. It’s not exactly what we predicted, but it’s the only one that relates to how a small drop in temperature can cause a larger drop.

94%

indicate how researchers ███ █████████ ███ ██ ████████ ███ ███████ ██ ██ █████ ██ ████████ ███████████

P4 has nothing to do with El Nino.

suggest a modification ██ ███ ███████ █████ ██ ███ ████████ █████ ███████ ███████ ██ ████████ ███████████

The author doesn’t suggest any changes to the feedback loop model. The author simply presents the feedback loop model.

PrepTest 106 - Section 4 - Passage 2 - Question 13

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