In the process of accretion, the larger debris objects thatsomehow managed to avoid spiraling into the sun arecalled _____.
A. protoplanets
B. chondrites
C. planetesimals
D. comets
C. planetesimals
Explanation: The largerobjects (up to 6.2 miles [10 kilometers] in diameter) thatsomehow managed to avoid spiraling into the sun arecalled planetesimals. The force of gravitational attractionbetween these objects caused many of them to assumeelliptical orbits, which led to regular violent collisionsbetween them. Although the extreme violence of manyof these collisions resulted in the disintegration of manyplanetesimals, others began to coalesce together throughgravity in a process known as accretion.
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At the turn of the twentieth century, most urban mass transit facilities were powered by
A) underground cables. B) horses. C) the internal combustion engine. D) electricity.
As seen in this photograph, Annie Oakley was typically portrayed as
A) a strong woman bent on challenging traditional gender roles. B) combining feminine beauty with masculine strength. C) upholding Victorian mores and values. D) the typical migrant from the East. E) a performer whose apparent skill was probably fake.
What large geographical area seems to have been the general center of the later Mayan civilization?
A) Lake Titicaca B) Mexico's west coast C) Isthmus of Tehuantepec D) Teotihuacan E) the Yucatan Peninsula
Voter turnout for presidential elections in the late nineteenth century was very high, averaging over 78 percent of all eligible voters.
Answer the following statement true (T) or false (F)