EAPS 105: HOMEWORK AND QUIZ 6
WITH COMPLETE SOLUTIONS
In Wikipedia, look up "Escape velocity" and answer this question: What is an escape
velocity? - Correct Answers -It is the minimum speed needed for an object to escape
from the gravitational influence of a primary body.
In Wikipedia, look up "Escape velocity" and answer this question: Assuming equal
mass, which will have the higher escape velocity from its surface, a large diameter
planet or a small diameter planet? (Hint: look at the equation for escape
velocity(speed).) - Correct Answers -Smaller diameter leads to higher escape velocity.
In Wikipedia, look up "Impact crater" and answer this question: Which of the following is
NOT a characteristic of impact craters?1. In Wikipedia, look up "Impact crater" and
answer this question: Which of the following is NOT a characteristic of impact craters? -
Correct Answers -a. They are approximately circular depression in the surface of a
planet, moon, or other solid body.
b. They typically have raised rims and floors that are lower in elevation than the
surrounding terrain.
c. They range from small, simple, bowl-shaped depressions to large, complex, multi-
ringed impact basins.
d. ***All the above are characteristics of impact craters.
In Wikipedia, look up "Impact crater" and answer this question: In which of the following
bodies are impact craters NOT the dominant geographical feature? - Correct Answers -
a. ***NO: Earth
b. YES: Mercury
c. YES: Calisto
d. NO: Ganymede
In Wikipedia, look up "Impact crater" and answer this question: Why are impact craters
not the dominant geographic feature on Venus, Mars, Europa, Io, and Titan? - Correct
Answers -Because craters on these bodies become eroded, buried, or transformed by
tectonics over time.
Why is a lot of iridium evidence of an asteroid impact? - Correct Answers -a. Because
asteroids have much more iridium than normally found on Earth's surface
b. Because it is only created under extremely high temperatures and pressures
, c. Because it is only found on the surface of the Earth after being excavated from much
deeper by an asteroid impact
d. All the above
How was Chicxulub Crater found? - Correct Answers -From gravity data
About how many Near-Earth Asteroids (NEAs) larger than 1 km in diameter are we
currently tracking? - Correct Answers -1000
In Wikipedia, look up "Impact crater" and answer this question: True or False: The rate
of crater production (how often planets or moons are hit by asteroids or comets) has
been fairly constant since the beginning of the Solar System. - Correct Answers -
***False
"The cratering rate in the inner solar system fluctuates as a consequence of collisions in
the asteroid belt that create a family of fragments that are often sent cascading into the
inner solar system."
In Wikipedia, look up "Impact crater", scroll down to "Crater formation", and answer this
question: Ignoring the slowing effects of travel through the atmosphere, what is the
minimum velocity an object from space will hit the Earth (or any other planet or moon for
that matter)? - Correct Answers -The planet or moon's escape velocity
In Wikipedia, look up "Impact crater", scroll down to "Crater formation", and answer this
question: Why are craters nearly always round? - Correct Answers -Because they are
caused be explosions.
In Wikipedia, look up "Impact crater", scroll down to "Crater formation", and answer this
question: In which of the following stages of crater formation does the crater reach its
maximum size (and depth), called the transient cavity? - Correct Answers -Excavation
In Wikipedia, look up "Complex crater" and answer this question: Which of the following
is NOT a characteristic of a complex crater? - Correct Answers -a. TRUE: They have
uplifted centers.
b. ***FALSE: They have curved floors (as opposed to flat).
c. TRUE: They have terraced walls.
In Wikipedia, look up "Multi-ringed basin"" and answer this question: Which of the
following is a characteristic of a multi-ringed basin? - Correct Answers -a. ***TRUE: It
contains multiple concentric topographic rings.
b. FALSE: It is bowl shaped.
c. FALSE: It has a peak ring center.
In Wikipedia, look up "Ejecta blanket"" and answer this question: What is an ejecta
blanket? - Correct Answers -It is a generally symmetrical apron of ejecta that surrounds
an impact crater.
WITH COMPLETE SOLUTIONS
In Wikipedia, look up "Escape velocity" and answer this question: What is an escape
velocity? - Correct Answers -It is the minimum speed needed for an object to escape
from the gravitational influence of a primary body.
In Wikipedia, look up "Escape velocity" and answer this question: Assuming equal
mass, which will have the higher escape velocity from its surface, a large diameter
planet or a small diameter planet? (Hint: look at the equation for escape
velocity(speed).) - Correct Answers -Smaller diameter leads to higher escape velocity.
In Wikipedia, look up "Impact crater" and answer this question: Which of the following is
NOT a characteristic of impact craters?1. In Wikipedia, look up "Impact crater" and
answer this question: Which of the following is NOT a characteristic of impact craters? -
Correct Answers -a. They are approximately circular depression in the surface of a
planet, moon, or other solid body.
b. They typically have raised rims and floors that are lower in elevation than the
surrounding terrain.
c. They range from small, simple, bowl-shaped depressions to large, complex, multi-
ringed impact basins.
d. ***All the above are characteristics of impact craters.
In Wikipedia, look up "Impact crater" and answer this question: In which of the following
bodies are impact craters NOT the dominant geographical feature? - Correct Answers -
a. ***NO: Earth
b. YES: Mercury
c. YES: Calisto
d. NO: Ganymede
In Wikipedia, look up "Impact crater" and answer this question: Why are impact craters
not the dominant geographic feature on Venus, Mars, Europa, Io, and Titan? - Correct
Answers -Because craters on these bodies become eroded, buried, or transformed by
tectonics over time.
Why is a lot of iridium evidence of an asteroid impact? - Correct Answers -a. Because
asteroids have much more iridium than normally found on Earth's surface
b. Because it is only created under extremely high temperatures and pressures
, c. Because it is only found on the surface of the Earth after being excavated from much
deeper by an asteroid impact
d. All the above
How was Chicxulub Crater found? - Correct Answers -From gravity data
About how many Near-Earth Asteroids (NEAs) larger than 1 km in diameter are we
currently tracking? - Correct Answers -1000
In Wikipedia, look up "Impact crater" and answer this question: True or False: The rate
of crater production (how often planets or moons are hit by asteroids or comets) has
been fairly constant since the beginning of the Solar System. - Correct Answers -
***False
"The cratering rate in the inner solar system fluctuates as a consequence of collisions in
the asteroid belt that create a family of fragments that are often sent cascading into the
inner solar system."
In Wikipedia, look up "Impact crater", scroll down to "Crater formation", and answer this
question: Ignoring the slowing effects of travel through the atmosphere, what is the
minimum velocity an object from space will hit the Earth (or any other planet or moon for
that matter)? - Correct Answers -The planet or moon's escape velocity
In Wikipedia, look up "Impact crater", scroll down to "Crater formation", and answer this
question: Why are craters nearly always round? - Correct Answers -Because they are
caused be explosions.
In Wikipedia, look up "Impact crater", scroll down to "Crater formation", and answer this
question: In which of the following stages of crater formation does the crater reach its
maximum size (and depth), called the transient cavity? - Correct Answers -Excavation
In Wikipedia, look up "Complex crater" and answer this question: Which of the following
is NOT a characteristic of a complex crater? - Correct Answers -a. TRUE: They have
uplifted centers.
b. ***FALSE: They have curved floors (as opposed to flat).
c. TRUE: They have terraced walls.
In Wikipedia, look up "Multi-ringed basin"" and answer this question: Which of the
following is a characteristic of a multi-ringed basin? - Correct Answers -a. ***TRUE: It
contains multiple concentric topographic rings.
b. FALSE: It is bowl shaped.
c. FALSE: It has a peak ring center.
In Wikipedia, look up "Ejecta blanket"" and answer this question: What is an ejecta
blanket? - Correct Answers -It is a generally symmetrical apron of ejecta that surrounds
an impact crater.
