Different ethnic groups provide more opportunity for prejudice, leading to more inner-country fighting, leading to more civil wars, leading to political instability. The list goes on really. <span />
The answer is (3), Saudi Arabia.
Answer: An aquifer is defined as a body of rock or unconsolidated sediment that has sufficient permeability to allow water to flow through it. Unconsolidated materials like gravel, sand, and even silt make relatively good aquifers, as do rocks like sandstone. Other rocks can be good aquifers if they are well fractured.
