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Question 23: A. According to scientists from NASA's Jet Propulsion Laboratory, the current melting of ice in Greenland is already causing the tilt to change at a rate of approximately 2.6 cm each year.
B. While a natural event such as this could bring about major changes to the climate, some scientists are warning that there is a possibility for reverse feedback.
C. The Earth's orbital tilt is said to vary between 22 and 25 degrees roughly every 41,000 years.
D. In other words, instead of an orbital tilt causing climate change, current changes in climate could end up causing changes in the Earth's axial tilt.
Sentence A states that the current melting of ice in Greenland is causing “the tilt” to change at a rate of 2.6 cm a year. Let us look at the other sentences to see what “the tilt” refers to. We see that sentence C clarifies this. Sentence C tells us that “the Earth’s orbital tilt” varies between 22 and 25 degrees very 41,000 years. There is however, no cogent link between sentences A and C. We can just say at this point that A follows C, but not immediately after.
Now sentence D begins with “in other words” and states that while an orbital tilt causes climate change, current changes in climate could end up causing changes in the Earth's axial tilt. Which sentence is sentence D paraphrasing? The only and obvious choice is sentence B, which says that though a natural event could bring about climate change, scientists are warning of a possibility for “reverse feedback”. So D follows B.
What is the “natural event” referred to in sentence B? The melting of ice in Greenland, or the variation in the Earth’s orbital tilt? Clearly, it is the latter. So B follows C.
The point about the melting of ice in Greenland changing the tilt is made to substantiate the theory that climate change can cause the Earth’s axial tilt to change.
The question is " Arrange the sentences in the correct order "
The order is CBDA
Choice C is the correct answer.
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