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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If the carbon dioxide in Earth's rocks were suddenly released into its atmosphere, what would happen?
a. It would rapidly escape into space. b. It would dissociate into carbon and oxygen. c. It would collect as ice on the north and south poles. d. It would cause a runaway greenhouse effect.
What do we mean by the "fossil record"?
A) rocks from earlier periods of the Earth's history B) samples of meteorites that fell to Earth early in its history C) remains of ancient organisms preserved in rocks D) an album by the Rolling Stones
Most asteroids are oblong in shape. Approximate an asteroid as being made up of two identical spheres of mass M and radius R that are just touching each other, in a figure eight
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
As rising air cools,
A) water vapor content decreases. B) relative humidity decreases. C) the moist adiabatic lapse rate increases. D) relative humidity increases.