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copper
Zambia is a major producer of copper.
There are several major producers in the US. Cargil, Tyson Foods, Monsanto and Smith Field Farms are major agricultural producers in the United States.
Uganda is not a major producer of oil.
Holland is a major producer of tulips.
Yes it is a major oil producer.
The largest industry in US is the oil and gas. This is considered to be a major industry with the highest producer of oil being Texas.
Your red bone marrow, in flat bones is the major producer of blood cells in the adult.
the Sun
no
itself
Iron is the major element in steel. Only an element can be an element, and an element can not be a compound, the definition of which requires more than one element.