by 
Anonymous
ANSWERS: 3
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Because that's where the dinosaus died. That area was rich in life, both flora and fauna, millions of years ago. The remains of the decayed plant and animal life is the oil.
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many years ago The arab countries were full of forest.When the European hunters hunted many lions and tigers,the herbivore population increased and the forests were eaten rapidly.This turned the forests into deserts.These animals later died without food and this is the reason for their oil wealth.
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Arab countries (the middle east) just happen to occupy a region of the world where large sedimentary basins rich in life existed mainly in Carboniferous to Cretaceous times... in which great accumulations of organic detritus formed and were deeply buried under thousands of metres of sand. Sand (sandstone) is the most common reservoir material for oil because it remains porous even under great compressive force whilst the softer sediments are compressed to the extent that the organic oils are squeezed out and mobilise upwards into structural traps, usually in sanstones. There are many other rich oilfields outside of the arab countries... The Gulf of Mexico / Texan basin, The Caspian Sea region, The North Sea, The Russian oilfields, The Indonesian basins, great river delta systems such as the Niger Delta, etc.
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