Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 15, Problem 22Q
To determine
The definition of near-Earth objects and the evidence that the Earth has been struck by near-Earth objects.
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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
A lot of asteroid and comet dust collides with Earth's atmosphere everyday. Assume that 500 tons of mass is added to Earth daily from the millions of meteors that enter our atmosphere. Estimate the time it would take for the Earth's mass to increase 0.2% with this impact rate. Is this mass accumulation significant to Earth as a planet.
Chapter 15 Solutions
Universe
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- Compare and contrast two planets in our Solar System with Earth. What are the signature features of those planets and how do they compare to Earth?arrow_forwardHow do impacts by comets and asteroids influence Earth’s geology, its atmosphere, and the evolution of life?arrow_forwardLook at the map of the Hawaiian chain of islands on the right-hand page of the Concept Art: Volcanoes. Which island formed most recently? How do you know? Is the newly formed volcano of a type found on Venus, on Mars, on both planets, or on neither?arrow_forward
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