Answer:
Commerce
Explanation:
The early Islamic empires involve in trade and commerce as their economic activity. Large trading networks spread in places like Africa, Europe, and China. Merchants dealt with trading goods including gold, slaves, textiles, spices, sugar, salt, and horses. Trade conducted through sea and land (Silk Road). Major trade cities were Constantinople, Cairo, Mecca, Medina, Baghdad, Morocco, and Cordoba.
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Natural gas is a )a nonrenewable resource. Natural gas is defined as "a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, and/or hydrogen sulfide."