The important contribution to navigation made by Eratosthenes in the third-century bc was a reasonably accurate calculation of the circumference of our planet.
Who is Eratosthenes?
Eratosthenes was born in 276 BC and died in 194 BC. He was a well-known poet, mathematician, a researcher in geography, and theorist of music. He was the first to gauge the size of the planet.
The Earth was first measured by Eratosthenes of Cyrene. The precise measurement of Earth's circumference was greatly aided by Eratosthenes' work in the third-century bc.
As a result, the Eratosthenes in the third century bc accurate calculation of the Earth.
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Answer:
Erosion is a natural process, though it is often increased by humans' use of the land. Deforestation, overgrazing, construction, and road building often expose soil and sediments and lead to increased erosion. Excessive erosion leads to loss of soil, ecosystem damage, and a buildup of sediments in water sources.
Explanation:
Answer:
the government
Explanation:
Progressives generally believed that industrialism and urbanization had created many social problems. Most agreed that the government should take a more active role in solving society's problems. Progressives belonged to both major political parties and usually were urban, educated middle-class Americans.
It was the aulos or tibia
Answer:
Although historians disagree about the extent of the social and material damage caused by the 9th- and 10th-century invasions, they agree that demographic growth began during the 10th century and perhaps earlier. They have also identified signs of the reorganization of lordship and agricultural labour, a process in which members of an order of experienced and determined warriors concentrated control of land in their own hands and coerced a largely free peasantry into subjection. Thus did the idea of the three orders of society—those who fight, those who pray, and those who labour—come into use to describe the results of the ascendancy of the landholding aristocracy and its clerical partners. In cooperation with bishops and ecclesiastical establishments, particularly great monastic foundations such as Cluny (established 910), the nobility of the late 11th and 12th centuries reorganized the agrarian landscape and rural society of western Europe and made it the base of urbanization, which was also well under way in the 11th century.
