Question 1

Clusters of asteroids such as the Apollos have orbits that intersect Earth's orbit;there are more than a thousand mountain-sized Apollo asteroids that could hit the Earth.

Accepted Answer

A) True 
 B)False

Question 2

The numbers of incoming objects are related to their size:

Accepted Answer

A)  the smaller the meteoroids,the greater their abundance
B)  the larger the meteoroids,the greater their abundance
C)  the number is the same for each size range
D)  the size is inversely proportional to the number

Question 3

Large meteorite impacts occur more frequently than small impacts.

Accepted Answer

A) True 
 B)False

Question 4

The relative numbers of incoming objects are not related to their size.

Accepted Answer

A) True 
 B)False

Question 5

Critical evidence for the Cretaceous-Tertiary boundary impact included _________________.

Accepted Answer

A)  dinosaur fossils worldwide just above the layer of impact debris
B)  an iridium anomaly in a thin layer of rock 65 million years old
C)  recovery of very large pieces of meteorite
D)  discovery of a crater covered by jungle vegetation in Brazil
E)  an Iranian deposit of reddish iron bearing strata

Question 6

Some asteroids are not solid bodies,but rather "rubble piles" held together by the mutual gravitational attraction of all the individual pieces.

Accepted Answer

A) True 
 B)False

Question 7

Why are there so many more impact craters visible on the Moon than on the Earth?

Accepted Answer

A)  The moon has been hit by many more meteorites than the Earth,particularly the >1 km diameter bodies that create the biggest craters
B)  The moon formed long before the earth formed,so has had more time to be hit by meteorites
C)  The moon is made out of softer rock than the Earth that is more readily deformed when impacted by meteorites
D)  Because of gravitational effects,the moon deflects many of the meteorites that would otherwise hit the Earth
E)  Craters on the Earth can be destroyed by erosion and mountain-building processes,or obscured by vegetation or sedimentation

Question 8

Relatively few impact craters have been discovered on Earth because _______________.

Accepted Answer

A)  most rocks are too resistant to crater
B)  the gravitational field is too weak
C)  weathering,erosion,and tectonic processes mask them
D)  bolides are very rare in this region
E)  Jupiter is so large it deflects them away from Earth

Question 9

When a meteorite large enough to cause a crater hits the Earth,the size of the impact crater is ________________.

Accepted Answer

A)  smaller than the meteorite
B)  perhaps 10-20 times the diameter of the meteorite
C)  about the same as the meteorite
D)  determined by the angle of impact
E)  determined mostly by the rock type at the point of impact

Exam 17: Impacts With Space Objects

Why are there so many more impact craters visible on the Moon than on the Earth?

Correct Answer
verified

Relatively few impact craters have been discovered on Earth because _______________.

Correct Answer
verified

When a meteorite large enough to cause a crater hits the Earth,the size of the impact crater is ________________.

Correct Answer
verified

The relative numbers of incoming objects are not related to their size.

Correct Answer
verified

Large meteorite impacts occur more frequently than small impacts.

Correct Answer
verified

Some asteroids are not solid bodies,but rather "rubble piles" held together by the mutual gravitational attraction of all the individual pieces.

Correct Answer
verified

Critical evidence for the Cretaceous-Tertiary boundary impact included _________________.

Correct Answer
verified

The numbers of incoming objects are related to their size:

Correct Answer
verified

Clusters of asteroids such as the Apollos have orbits that intersect Earth's orbit;there are more than a thousand mountain-sized Apollo asteroids that could hit the Earth.

Correct Answer
verified

Exam 17: Impacts With Space Objects

Why are there so many more impact craters visible on the Moon than on the Earth?

Correct AnswerverifiedShow Answer

Relatively few impact craters have been discovered on Earth because _______________.

Correct AnswerverifiedShow Answer

When a meteorite large enough to cause a crater hits the Earth,the size of the impact crater is ________________.

Correct AnswerverifiedShow Answer

The relative numbers of incoming objects are not related to their size.

Correct AnswerverifiedShow Answer

Large meteorite impacts occur more frequently than small impacts.

Correct AnswerverifiedShow Answer

Some asteroids are not solid bodies,but rather "rubble piles" held together by the mutual gravitational attraction of all the individual pieces.

Correct AnswerverifiedShow Answer

Critical evidence for the Cretaceous-Tertiary boundary impact included _________________.

Correct AnswerverifiedShow Answer

The numbers of incoming objects are related to their size:

Correct AnswerverifiedShow Answer

Clusters of asteroids such as the Apollos have orbits that intersect Earth's orbit;there are more than a thousand mountain-sized Apollo asteroids that could hit the Earth.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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