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An atmosphere can escape a planet if the escape velocity is six times the average molecularspeed at that temperature.

A) True
B) False

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The scarps on Mercury are extremely similar to the cratered lunar highlands in appearance.

A) True
B) False

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Which of the following is NOT a factor in determining whether a body in the solar systemretains an atmosphere?


A) composition and weight of the gases
B) escape velocity
C) axial tilt
D) rotation rate
E) distance from the Sun

F) B) and E)
G) A) and E)

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List the two major regions of the near side of the Moon, as seen with the naked eye.

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The darker...

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The lunar regolith is constantly eroded by ________.

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The slow ________ of Mercury was first determined using radar signals sent from Earth.

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Which of these theories seems to best explain the Moon's origin?


A) Impact Theory
B) Capture Theory
C) Coformation Theory
D) Fission Theory
E) Fusion Theory

F) All of the above
G) A) and C)

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Based on Mercury's peak temperature of about 700 K, what would the average molecularspeed of carbon dioxide be? How does this compare to Mercury's escape velocity? If Mercury'satmosphere initially had substantial carbon dioxide, in line with what is believed about the earlyatmospheres of the other terrestrial planets, do you think Mercury would have retained thisatmosphere? Why/why not? Would your answer change if you considered only Mercury'scoldest regions that are around 125 K?

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Carbon dioxide's average speed would be ...

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The rate of cratering:


A) has remained constant over the last 4.6 billion years.
B) has recently increased with more collisions in the asteroid belt.
C) fluctuates over time, with massive bodies occasionally coming in from the Oort Cloud.
D) shows that large asteroid impacts are more common now than in the past.
E) shows that most interplanetary debris was swept up soon after the formation of the solarsystem.

F) B) and C)
G) A) and E)

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Mercury experiences extreme high and low temperatures between night and day because:


A) it is so close to the Sun.
B) its dense atmosphere creates a runaway greenhouse.
C) its oceans are much hotter than ours.
D) Mercury has no axial tilt, with its equator always exposed to direct sunlight.
E) it has no true atmosphere to moderate temperatures over the globe.

F) B) and C)
G) C) and E)

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The youngest features visible with telescopes on the Moon are:


A) the volcanoes seen erupting in the highlands.
B) the craters sitting atop the mare.
C) the darkest regions of the mare.
D) the bright polar caps of new ice.
E) the scarps recently created by tectonic activity.

F) B) and C)
G) C) and D)

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The chief erosive agent now on the Moon is:


A) lunar ice melting and refreezing in the polar regions.
B) lava flows welling up in the mare.
C) volcanic vents in the rugged highlands.
D) the rain of micrometeorites chewing up the regolith.
E) rain from cometary debris melting as it enters the Moon's atmosphere.

F) C) and D)
G) B) and C)

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Describe some of the features of Mercury's surface and briefly explain how these features arebelieved to have formed.

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Scarps:Long, cliff-like structures that ...

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What two properties of Mercury imply that it is differentiated?


A) its size and magnetic field
B) its large average density and its surface features
C) its surface features and its size
D) its large average density and its magnetic field
E) its magnetic field and its surface features

F) None of the above
G) All of the above

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What aspect of Mercury's interior structure is used to explain the presence of its magneticfield?

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its unusua...

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The Moon has a period of rotation that is ________ to its period of revolution.

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Mercury's evolution was different from the Moon's because:


A) Mercury developed a dense atmosphere while the Moon never did.
B) Mercury was located farther from Earth, so experienced no tidal forces.
C) Mercury was subject to more intense asteroid bombardment than the Moon.
D) dense Mercury had an iron core that shrank, creating the tall scarps.
E) Mercury developed a strong magnetic field to protect it from solar radiation.

F) A) and B)
G) C) and D)

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The cratering of the lunar highlands shows us:


A) they are younger than the maria.
B) they are older than the smoother maria.
C) they have been unchanged for the last 4.6 billion years.
D) they are like the Earth's continents, removed from the tectonic cycle of the mare.
E) they were made of more rigid lavas than the basalts that made the maria.

F) A) and D)
G) C) and E)

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Why is it so difficult to observe the planet Mercury from Earth?

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Mercury is so close to the Sun...

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The spacecraft which first revealed the possibility of lunar ice are:


A) Lunar Ranger and Surveyor.
B) Apollos XI and XVII.
C) Lunar Orbiter and Rover.
D) Clementine and Lunar Prospector.
E) Vikings 1 and 2.

F) A) and B)
G) B) and D)

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Showing 41 - 60 of 113

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