The bottom of geothermal sources is abundant in black-colored ores (sulfites) of iron, copper, zinc, nickel and other metals called "black smokers". Iron ores are rocks from which metallic iron can be obtained. Metals, originally disseminated on magma-laden or rocky paths, are concentrated in fluids and can be redeposited if they encounter favorable temperatures and pressure conditions, forming mineral veins.
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n the short term, the Mongols constructed the larges Eurasian empire to date. In the process, they destroyed a series of well-established empires. They wreaked extensive destruction on settled populations. ... The fostered the spread of the Black Death across Eurasia.
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I think it's b) Central and c) Federalism
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I read a article about it
Answer: first appearances of gunpowder artillery
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