The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid water-rich world.
b. the climate on Mars was different billions of years ago.
c. volcanism is occurring on Mars.
d. the polar caps are made of liquid water.
e. all of the above
Question 2Astronomers now speculate that a galaxy's shape depends on all of the following except
a. the rate of star formation.
b. the history of past collisions.
c. the mass.
d. All of these may be important in determining a galaxy's shape
Question 3Measurements of the magnetic field of Venus reveal that the
a. planet has a large iron core.
b. interior of the planet is molten.
c. planet has no detectable magnetic field.
d. planet rotates backwards.
e. magnetic field is responsible for large auroral displays (northern lights) on Venus.
Question 4Galactic cannibalism refers to
a. binary galaxies.
b. the merging of galaxies.
c. galaxies drawing in gas from the intergalactic medium.
d. the destruction of a galaxies globular clusters by the galaxies nucleus.
e. none of these
Question 5The greenhouse effect keeps Venus hot because
a. the atmosphere contains free oxygen.
b. the atmosphere is predominently carbon dioxide.
c. the surface converts infrared into visible radiation.
d. the surface is free of sulfur compounds.
e. the magnetic field traps a large number of particles from the solar wind.
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