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An era is not a defined number of years. Rather, it is a period of time marked by certain characteristics, such as historical events. In geology, an era is composed of periods.


The current era on the geologic time scale is the Cenozoic Era. The era began after the K-T extinction resulted in the end of the Mesozoic Era around 65 million years ago.


Generally, the eras used to describe the modern Earth are the Quaternary geological era and the Cenozoic evolutionary era. In the future, there may also be a historical era that the current time period, the 21st century, will belong to.


The Era of Good Feelings was the time between 1817 to 1825 when the United States was dominated by one political party and had little concern about intervention by foreign countries. The phrase was first used on July 12, 1817 in the Boston Columbian Centinel after a visit by President James Monroe t


Listening to classical music reduces stress, lowers blood pressure, alleviates insomnia and helps relieve chronic pain as well as pain after surgery. Studies also suggest correlations between listening to classical music, improved learning and higher IQ scores, according to WQXR.


Online music streaming services such as Pandora and iHeartRadio have free stations dedicated exclusively dedicated to classic country music. Radio database websites, such as Live365, also contain lists of local and national radio stations with online streaming capabilities.


The era occurring before the current geologic era was the Mesozoic, which began roughly 245 million years ago and ended about 64 million years ago. The Mesozoic era consisted of three periods; from oldest to more recent, they are the Triassic, the Jurassic and the Cretaceous periods.


The four eras in the history of marketing are known as the production era, sales era, marketing era and marketing control, or relationship, era. Some analyses only include the first three of these.


KDFC, WRCJ and WQXR are free classical music radio channels servicing San Francisco, Michigan and New York City, respectively. The stations' dial positions are 89.9 FM, 90.9 FM and 105.9 FM.


A classic work is an expression of art, life and beauty, according to About.com. The work is a reflection of the time period during which it was written, and it stands the test of time.