Which reason best explains why american cities grew in the late 1800s?
a. cities were clean, peaceful places to settle.
b. cities offered more jobs and opportunities.
c. rural areas had become empty and abandoned.
d. rural areas had ceased to offer employment for workers.

Option B, Cities offered more jobs and opportunities is the right answer.  

Numerous factors were responsible for the growth of cities in the late 1800s in the United States, including the growth of factories, the need for jobs and the immigrants. Arriving from around the world these Immigrants helped for the population growth of cities, and the migration of rural American population (particularly farmers- as machines were used in many farms, moved to cities to find new jobs) led to a significant increase in the population of these cities.  Chicago is one of the examples of a growing city during the late 1800.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

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