The government is led by a dictator with total power have a great day (:
        
             
        
        
        
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.
Learn more about Eratosthenes, here:
brainly.com/question/1995686
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The economic decision that made consumer goods so difficult to get in the Soviet Union until the late 1980s was: <span>The emphasis on heavy industry
During that period, Soviet Union focus its economic forces to produce various heavy equipment in order to win the Space Race against united states. Because of this, the smaller industries receive no subsidies from the government, causing the price of any imported goods became heavily inflated.</span>
        
             
        
        
        
Answer:
A major change in the iron industries during the era of the Industrial Revolution was the replacement of wood and other bio-fuels with coal.
Explanation: