单选题
According to the explanation given in the passage, which of the following causes superbubbles to gradually assume the shape of a chimney?
A、
The gravitational attraction of supernovas adjacent to the region of the chimney' s formation
B、
The effect of entropy on the relative abundance of hot interior gas within the superbubble
C、
A chemical reaction involving ionized trace ions at the heart of the superbubble
D、
A tendency toward coalescence in the gases that contribute to the formation of the superbubble
E、
(E) A natural buoyancy of the superbubble, which causes the chimney to stretch and become a gaseous conduit
【正确答案】
E
【答案解析】
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