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Read the passage below and answer the following questions. Geologists Harris and Gass hypothesized that the Red Sea rift developed along the line of a suture (a splice in the Earth’s crust) formed during the late Proterozoic era, and that significant observable differences in the composition of the upper layers of rocks deposited on either side of the suture give clues to the different natures of the underlying igneous rocks. Other geologists argued that neither the upper rock layer nor the underlying igneous rocks on the one side of the rift differ fundamentally from the corresponding layers on the other side. These geologists believe, therefore, that there is inadequate evidence to conclude that a suture underlies the rift. In response, Harris and Gass asserted that the upper rock layers on the two sides of the rift had not been shown to be of similar age, structure, or geochemical content. Furthermore, they cited new evidence that the underlying igneous rocks on either side of the rift contain significantly different kinds of rare metals.
According to the passage, Harris and Gass have mentioned all of the following properties of rocks along the Red Sea rift EXCEPT:
age of the upper layers of rock
Age of the underlying igneous rocks
geochemical content of the upper layers of rocks
metallic content of the underlying igneous rocks
- Harris and Gass propose that the Red Sea rift is along an ancient suture.
- They argue differences in the rocks' composition on either side of this suture.
- Upper rock layers: Not shown to be the same age, structure, or geochemical content.
- Option 1: Age of the upper layers is mentioned.
- Option 2: Age of the underlying igneous rocks is not mentioned.
- Option 3: Geochemical content of upper layers is mentioned.
- Option 4: Difference in metallic content of underlying rocks is cited.
- Harris and Gass specifically mention the metallic, not the age, of underlying rocks.
Option 2 is the correct answer.
By: Munesh Kumari ProfileResourcesReport error
Priyanka
Correct option should be B
vikram madan
in second last line it is clearly written upper layers on the two ides of the rift had not shown to be of similar age
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