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These atoms will decay as the rock ages, and by measuring the ratio of radioactive isotopes within the rock, scientists can figure out how long it has been around. In 1913, geologist Arthur Holmes published “the Age of the Earth,” the first major effort to date the planet using radiometric dating.
They were among the first to develop a system of uniform weights and measures. Their building bricks w<span> This was the first civilization to incorporate urban sanitation systems. Personal hygiene seems to have been a high priority. </span>ere very uniform making city planning easy. <span> Transportation and trade were major goals of these people. Their trade network ran from Mesopotamia to northern and central India. Their empire was economic, not military. </span>
Andrew Jackson was born in 1767 in the Waxhaws region between North Carolina and South Carolina. A lawyer and a landowner, he became a national war hero after defeating the British in the Battle of New Orleans during the War of 1812. Jackson was elected the seventh president of the United States in 1828.P
The people who engaged in the political revolution wanted war because they thought war would unify the country. The had a desire to spread ideas of the Revolution to all of Europe.
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Unlike earlier Greek theatres that were built into hillsides, the Colosseum is an entirely free-standing structure. It derives its basic exterior and interior architecture from that of two Roman theatres back to back. ... The remainder of the present-day exterior of the Colosseum is in fact the original interior wall.
