What happens after many generations of the star-gas-star cycle?
A) The heavy element abundance decreases; the amount of gas increases.
B) The heavy element abundance increases; the amount of gas decreases.
C) The heavy element abundance increases; the amount of gas stays the same.
D) The amount of gas and heavy elements stay the same: it's a cycle.
E) The heavy element abundance stays the same; the amount of gas decreases.
F) The heavy element abundance increases; the amount of gas increases.
B
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In terms of G, M, and R, what is the escape velocity for a spaceship taking off from the top of the figure eight? A) (2GM/R)1/2 B) (4GM/3R)1/2 C) (8GM/3R)1/2 D) (3GM/R)1/2 E) (7GM/5R)1/2
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As rising air cools,
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What do we mean by the "fossil record"?
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