ASTR 1020 FINAL EXAM LATEST EXAM
| ALL QUESTIONS AND CORRECT
ANSWERS | GRADED A+ | VERIFIED
ANSWERS | JUST RELEASED
The main process by which heat flows upward through the lithosphere is
A) conduction.
B) convection.
C) radiation.
D) accretion.
E) differentiation. ------CORRECT ANSWER---------------A) conduction.
Heat escapes from a planet's surface into space by thermal radiation.
Planets radiate almost entirely in the wavelength range of the
A) infrared.
B) radio.
C) visible.
D) ultraviolet.
E) none of the above ------CORRECT ANSWER---------------A) infrared.
Which of the following worlds have the thinnest lithospheres?
A) Earth and the Moon
B) Venus and the Moon
C) Mercury and Venus
D) Earth and Mars
E) Earth and Venus ------CORRECT ANSWER---------------E) Earth and
Venus
Which of the following best describes why the smaller terrestrial worlds
have cooler interiors than the larger ones?
,A) They were cooler when they formed.
B) The smaller ones are farther from the Sun.
C) They have relatively fewer radioactive elements.
D) They have relatively more surface area compared to their volumes.
E) They had more volcanic eruptions in the past, which released their
internal heat. ------CORRECT ANSWER---------------D) They have relatively
more surface area compared to their volumes.
Which of the terrestrial worlds has the strongest magnetic field?
A) Mars
B) Earth
C) the Moon
D) Venus
E) Mercury ------CORRECT ANSWER---------------B) Earth
Why does Earth have the strongest magnetic field among the terrestrial
worlds?
A) It is the only one that has a metallic core.
B) It rotates much faster than any other terrestrial world.
C) It is the only one that has both a partially molten metallic core and
reasonably rapid rotation.
D) It is by far the largest terrestrial world.
E) It is the most volcanically active world. ------CORRECT ANSWER----------
-----C) It is the only one that has both a partially molten metallic core and
reasonably rapid rotation.
Which of the following most likely explains why Venus does not have a
strong magnetic field?
A) It does not have a metallic core.
B) Its rotation is too slow.
C) It is too close to the Sun.
D) It is too large.
E) It has too thick an atmosphere. ------CORRECT ANSWER---------------B)
Its rotation is too slow.
,What are the conditions necessary for a terrestrial planet to have a strong
magnetic field?
A) a molten metallic core only
B) fast rotation only
C) a rocky mantle only
D) both a molten metallic core and reasonably fast rotation
E) both a metal core and a rocky mantle ------CORRECT ANSWER-----------
----D) both a molten metallic core and reasonably fast rotation
Which of the following has virtually no effect on the structure of a planet?
A) its composition
B) its size
C) its magnetic field
D) its mass ------CORRECT ANSWER---------------C) its magnetic field
Which two properties are most important in determining the surface
temperature of a planet?
A) composition and distance from the Sun
B) size and chemical composition
C) size and atmosphere
D) internal temperature and atmosphere
E) distance from the Sun and atmosphere ------CORRECT ANSWER---------
------E) distance from the Sun and atmosphere
Which of the following does not have a major effect in shaping planetary
surfaces?
A) impact cratering
B) volcanism
C) tectonics
D) erosion
E) magnetism ------CORRECT ANSWER---------------E) magnetism
, How large is an impact crater compared to the size of the impactor?
A) the same size
B) 10-20 percent larger
C) 10 times larger
D) 100 times larger
E) 1,000 times larger ------CORRECT ANSWER---------------C) 10 times
larger
The relatively few craters that we see within the lunar maria
A) were formed by impacts that occurred before those that formed most of
the craters in the lunar highlands.
B) were formed by impacts that occurred after those that formed most of
the craters in the lunar highlands.
C) were created by the same large impactor that led to the formation of the
maria.
D) are volcanic in origin, rather than from impacts.
E) are sinkholes that formed when sections of the maria collapsed. ------
CORRECT ANSWER---------------B) were formed by impacts that occurred
after those that formed most of the craters in the lunar highlands.
When we see a region of a planet that is not as heavily cratered as other
regions, we conclude that
A) there is little volcanic activity to create craters.
B) the planet is rotating very slowly and only one side was hit by impactors.
C) the planet formed after the age of bombardment and missed out on
getting hit by leftover planetesimals.
D) the surface in the region is older than the surface in more heavily
cratered regions.
E) the surface in the region is younger than the surface in more heavily
cratered regions. ------CORRECT ANSWER---------------E) the surface in the
region is younger than the surface in more heavily cratered regions.
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