21st Century Astronomy (fifth Edition)
5th Edition
ISBN: 9780393603330
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 8.1, Problem 8.1CYU
To determine
The reason for the determination of relative age of features on a world from the given options.
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Scientists find evidence of a large meteor impact on the coast of the YucatánPeninsula in Mexico. What can the scientists most likely expect to find in the layers of rock that are about the same age as the impact?A. evidence of the mass extinction of many speciesB. evidence of a gradual change of one species over timeC. evidence of a rapid change in one speciesD. evidence of the stability of many species over time
Which of the following is least reasonable regarding impact craters?
Group of answer choices
The size and shape of the crater and the amount of material excavated depends on factors such as the velocity and mass of the impacting body and the geology of the surface.
Craters are most often are circular but more elongate craters can be produced with impactors striking the surface at very low angles.
The Moon has more craters than the Earth because of its strong tidal force on the impactors.
Objects from space typically hit Earth at about 20 km/s ande produce craters that can be approximately 20 times larger in diameter than the impacting objects.
The faster the incoming impactor, the larger the crater.
How many impacts would you expect to strike a 100m2 region in one hour during Earth’s formation, assuming that Earth grew to its present size in 10 million years from particles averaging 100 grams each? (Hint: Assume that Earth had its current radius of 6378km.) (Notes: The surface area of a sphere is 4pir2 ; 1yr=3.2x107 .)
a. About 1300.
b. About 13 .
c. About 13,000.
d. About 130
Chapter 8 Solutions
21st Century Astronomy (fifth Edition)
Ch. 8.1 - Prob. 8.1CYUCh. 8.2 - Prob. 8.2CYUCh. 8.3 - Prob. 8.3CYUCh. 8.3 - Prob. 8.4CYUCh. 8.4 - Prob. 8.5CYUCh. 8.5 - Prob. 8.6CYUCh. 8.6 - Prob. 8.7CYUCh. 8 - Prob. 1QPCh. 8 - Prob. 2QPCh. 8 - Prob. 3QP
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