This natural resource has made the persian gulf nations wealthy. 1.gold 2.natural gas 3.oil 4.sulfur

3. Oil
Oil is the most important export in the world currently, so it helps the nations wealthy.

Oil

Explanation:

The Persian Gulf and its coastal areas are the world's largest sources of petroleum and the Safaniya oil field is the world's largest offshore field located on the Persian Gulf. The gulf has a length of 989 kilometers with a surface area of 251,000 kilometers square. The oil-rich reserves are narrowly located in the marshy river delta. The Persian Gulf is home to an island like the Bahrain, Qeshim including the greater Tunb, lesser tunb.

Answer the use of flood plains and irrigation;