Evidence for very recent water erosion on Mars comes from the observations of
A) dark streaks on crater walls
B) channels carved on the slopes of volcanoes
C) dried up river beds on the highlands
D) mud flows surrounding craters
A
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A circular orbit would have an eccentricity of:
A) 0. B) between 0 and 0.5. C) between 0.5 and 1. D) exactly 1.0. E) infinity.
The planet closest in size to Earth is
A) Mercury. B) Venus. C) the Moon. D) Mars. E) Pluto.
A wooden block slides directly down an inclined plane, at a constant velocity of 6.0 m/s. How large is the coefficient of kinetic friction, ?k, if the plane makes an angle of 25.° with the horizontal?
A) 0.47 B) 0.91 C) 1.2 D) 0.42 E) 0.37
As a 6 solar-mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) remains roughly constant. B) decreases. C) first increases, then decreases. D) increases. E) first decreases, then increases.