Exam 9: Planetary Geology: Earth and the Other Terrestrial Worlds

A) the terrestrial worlds as a whole are made mostly of metal.
B) metals sunk to the centers a long time ago when the interiors were molten throughout.
C) the core contained lots of radioactive elements that decayed into metals.
D) over billions of years,convection gradually brought dense metals downward to the core.

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A) geological activity.
B) temperature.
C) strength.
D) composition.
E) color.

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D

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Accretion is heat generated by the agglo...

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A) Earth and the Moon
B) Venus and the Moon
C) Mercury and Venus
D) Earth and Mars
E) Earth and Venus

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A) Mercury.
B) Venus.
C) Moon.
D) Mars.
E) Spacecraft have landed on all of the terrestrial worlds.

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A) its composition
B) its distance from the Sun
C) whether or not it has liquid water
D) its size

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A) Impact cratering is the only major geological process that has affected their surfaces.
B) All four geological processes were important in their early histories,but only impact cratering still reshapes their surfaces today.
C) Impact cratering shaped these worlds early in their histories.Then,during the past few million years,they were reshaped by episodes of volcanism and tectonics.
D) Early in their histories,they suffered many impacts and experienced some volcanism and tectonics,but they now have little geological activity at all.

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A) a huge shield volcano on Mars.
B) a huge stratovolcano on Venus.
C) a large lava plain on the Moon.
D) a great canyon on Mars.

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A) charged particles or magnetized materials (such as iron)
B) rocks of all types
C) iron-bearing minerals only
D) bases and liquids

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A

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Mercury has a negligible atmosphere from...

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A) mantle,core,crust
B) mantle,crust,core
C) core,mantle,crust
D) core,crust,lithosphere

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Even though impacts still occur today,the vast majority of craters formed during the bombardment period that ended around 3.8 billion years ago.A surface region that is still saturated with craters must have remained essentially undisturbed for the last 3.8 billion years.In contrast,a surface region that has few craters indicates that the original craters must have been somehow "erased" since then.

A) is as runny as liquid water.
B) has a medium viscosity.
C) has a high viscosity.
D) can have any viscosity.

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A) Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it.
B) Continental crust is made from volcanic rock called basalt,which is lower in density than what the seafloor crust is made from.
C) Continental crust is made of rock,while seafloor crust has more metals.
D) Seafloor crust is more compact due to the weight of the oceans,but it is made of the same material as the continental crust.
E) Continental crust is actually denser than seafloor crust.

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A) accretion
B) differentiation
C) radioactivity
D) tidal heating
E) all of the above

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