mjssgmat wrote:
For question 1.
the cloud contraction can begin after process of fusion. Why isn't this an option?
If fusion happens around clouds.
Official Explanation
1. The author of the passage suggests that cloud contraction may begin in which of the following ways?
Explanation
In the third paragraph, “The natural rotation of a galaxy,” “surrounding supernovae,” and “density waves” are listed as examples of the outside influence “evidently required for a theoretically unstable cloud to initiate collapse.”
The first statement is a trap—fusion appears in the first paragraph and the author does not suggest that it leads to cloud contraction. (While the passage does suggest that fusion is related to supernovae and that supernovae can contribute to cloud collapse, don’t fill in the gaps yourself—the passage simply does not provide enough information to infer that fusion is part of a series of events that begins cloud contraction.)
The second statement is true (realizing this requires you to match up “explosions of stars” in the answer choice with “supernovae” in the third paragraph).
The third statement is a distortion—forcing debris inward, not outward, may cause cloud contraction to beg in.
Answer: B