To establish some perspective on this subject is extremely difficult, but among all the hypotheses explaining the phenomenon, the most likely hypothesis Sartorius von Valypersgauzena. According to the commonly held view Earth was originally molten ball. Upon cooling, the latter a variety of substances were located closer to the center or away from it depending on their weight: heavy mass is concentrated in the center, lighter settled around him in a series of successive concentric layers. Since acid-rich silicates (normal trachytes) have a smaller specific weight, then they formed the outer layer of the original globe; poor are silica silicates (normal basalts) are located deeper. Thus the two areas from which the volcano gets lava lie on each other; trahitovye lava erupting from a lesser depth, basalt - more.
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