Although the climate of the middle east varies, one constant is that

Had to look for the options and here is my answer.
Knowing that Middle East's climate changes from time to time, the only thing that is constant in their climate is that rainfall is minimal in this region. The Middle East has only two climates: wet and dry. But most of the time, this region has always that hot and dry climate.

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Ibelieve it was because of the gas act in order to preserve fuel