production and sale of energy
According to the CIA, Saudi Arabia's is an oil-based economy, with 87% of Saudi's budget revenues, 90% of export earnings, and 42% of GDP
it depends for water
Nothing. Tourism I suppose.
food
Saudi Arabia is the world's largest producer of oil. It is the cornerstone of its economy. The USA is the largest customer of Saudi oil.
mixed
the people of the tribe
Islam is the main religion of Saudi Arabia.
It's green and white.
im not so sure since its a monarchy
Saudi Arabia's allies are mainly Islamic and Arab nations, such as Iraq, Iran, Qatar, Bahrain, and Yemen.
Pfft, Muslim... It's kinda illegal to be any other religion there.
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The oil in Saudi Arabia will not be exhausted by 2040. Estimates give it far longer than that; it is the Gulf Countries that are more limited in their reserves. As for the meat of the question, e.g. what will happen to the Saudi economy when the reserves are, it will depend on how the income has been invested. Saudi Arabia has historically been slower to diversify its portfolio and, if current investment trends continue, Saudi Arabia will have a sharp decline following the exhaustion of its reserves.
Saudi Arabia has the most oil reserves in the world
oil