On the territory of Saudi Arabia, in the region of the Hafer Kishb basalt plateau, there is a unique place Al Waba, the largest crater in the Middle East that has a diameter of 2 kilometers.
Sodium phosphate lays at the basis of these white crystals. The scientists for a long time believed that this crater was created by a meteorite impact. Now, the researchers agree that it is the result of volcanic activity. The proof of this fact is a layer of volcanic ash present in a part of the crater. In addition to that, the dessert around the crater is created not from sand but from volcanic ash. When viewed from a distance, can be seen the base of the volcano, which is significantly larger than the crater itself.
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