Examlex
What was the most desired commodity in long-distance trade?
Coal
A combustible black or brownish-black sedimentary rock formed from ancient plant material, rich in carbon, used as a fuel.
Oil Seeps
Natural leakages of crude oil from the ground due to geological formations breaking the surface.
Salt
A mineral composed primarily of sodium chloride (NaCl), used in food seasoning and preservation, and industrially in chemical production.
Energy Resource
A natural or artificial source of power that can be converted into useful energy, such as fossil fuels, solar, or wind power.
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