Explanation:

• Statement 1 is correct: Crude oil is a naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials. A type of fossil fuel, crude oil can be refined to produce usable products such as gasoline, diesel and various forms of petrochemicals. It is a non¬ renewable resource.
• Crude oil is typically obtained through drilling, where it is usually found alongside other resources, such as natural gas (which is lighter and therefore sits above the crude oil) and saline water (which is denser and sinks below).
• Crude oil is classified into two types, Sweet crude and Sour Crude depending on the content of Sulphur present in it.
• Statement 2 is not correct: Crude oil may be referred to as sweet if it contains relatively little sulphur (0.5%) or sour if it contains substantial amounts of sulphur. 
• Sweet crude requires less energy to be extracted and once extracted, yields higher quality gasoline as well as larger quantities of it.
• Statement 3 is not correct: Iraq is one of the leading producers of sweet crude.
• Major locations where sweet crude is found include the Appalachian Basin in Eastern North America, Western Texas, the Bakken Formation of North Dakota and Saskatchewan, the North Sea of Europe, North Africa, Australia, and the Far East including Indonesia.
• Sour crude, on the other hand, has a high level of impurities in it, namely sulphur, which must first be removed before being processed into gas and other petroleum-based products. Venezuela is a leading producer of sour crude oil. Sour crude is more common in the Gulf of Mexico, Mexico, South America, and Canada. Crude produced by OPEC member nations also tends to be relatively sour, with an average sulphur content of 1.77%.