Question Bank / Reading and Writing / Command of Evidence
Command of Evidence SAT question
Reading and Writing · Information and Ideas · Hard · Answer it here, explanation included.
Several studies of sediment (e.g., dirt, pieces of rock, etc.) in streams have shown an inverse correlation between sediment grain size and downstream distance from the primary sediment source, suggesting that stream length has a sorting effect on sediment. In a study of sediment sampled at more than a dozen sites in Alpine streams, however, geologists Camille Litty and Fritz Schlunegger found that cross-site variations in grain size were not associated with differences in downstream distance, though they did not conclude that downstream distance is irrelevant to grain size. Rather, they concluded that sediment influx in these streams may have been sufficiently spatially diffuse to prevent the typical sorting effect from being observed.
Which finding about the streams in the study, if true, would most directly support Litty and Schlunegger’s conclusion?
ExplanationShow
Choice A is the best answer. This finding would support the conclusion. If stream banks are collapsing into the water at multiple points, then sediment is getting into the water at those various points. This supports the conclusion that the inflow of sediment is very spread out.
Choice B is incorrect. This finding wouldn’t support the conclusion. The conclusion is about the influx of sediment being “spatially diffuse,” meaning spread out over a large area. The type of sediment wouldn’t have an impact on the conclusions. Choice C is incorrect. This finding wouldn’t support the conclusion. It doesn’t say anything about the influx of sediment being “spatially diffuse” (spread out). Choice D is incorrect. This finding wouldn’t support the conclusion. Any sediment that enters downstream of the sampling sites wouldn’t end up in the samples, so it wouldn’t affect the findings or the conclusion.
Drill this skill on Aceit
Adaptive practice, a daily plan, and score tracking take a free account so we can save your work.
More Command of Evidence questions
- 1,3001,2001,1001,0009008007006005004003002001000Number of municipalitiesno responseresponded to inquiryoffered incentiveMunicipalities’ Responses to Inquiries about Potential Incen
- Although many transposons, DNA sequences that move within an organism's genome through shuffling or duplication, have become corrupted and inactive over time, those from the long i
- Sample of Food Items from Gemini Mission Menus Food itemDayMealSugar cookie cubes1BChicken and vegetables2BShrimp cocktail4CHot cocoa3A To make sure they got the nutrition they ne
- 200150100500Uncertainty(larger values = more uncertainty) 2005 2006 2007 2008 2009 2010Economic Policy Uncertainty in the United Kingdom, 2005–2010Year tax and public spendin
- 140,000120,000100,00080,00060,00040,00020,0000Area (square meters)198719932006Characteristics of the Banks of the Provo River Downstream of the Jordanelle DamYear grass cover bare
- 605550454035302520151050Female farmersas a percentage of totalnorth Ondocentral Ondosouth OndoPercentage of Ondo State Small-Scale Farmers Who Are Female, by Main Crop GrownOndo St