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heliocentric- having or representing the sun as the center, as in the accepted astronomical model of the solar system.
revolution- is a fundamental and relatively sudden change
Railroad system- The operation is carried out by a railway company, providing transport between train stations or freight customer facilities.
Agricultural Revolution- was a period of technological improvement and increased crop productivity that occurred during the 18th and early 19th centuries in Europe.
Natural resources- materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain.
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