Within the author's rotational concept a brief review of geodynamic movements of the block rotating nonlinear geomedium is done. Such geodynamic movements appear to be consistent with the volcanic process. It is shown that the magma chambers that fed the strong eruption of the planet over the last million years, have a constant thickness of about 0.5 km, which does not depend on the time and type of volcanic eruption, or on its location. The new model of the magma chamber is described. The model is based on the concepts of plastic flow of “solid” substance along the block boundaries, its “overheating” above the melting point and the elastic strain with energy of 1015 J/km3 of superheated rock formed around “solid magma” chamber. Within the rotational concepts such elastic stresses can explained the migration of volcanic activity itself and its interaction with seismicity and tectonics. Magma chambers with such properties don’t depend on the volcanic process and, in fact, are a reflection of a well-defined geodynamic condition of the Earth's crust. Since the set of magma chambers beneath the volcanic belt forms a unified thin layer, properties of these chambers can be extended to the entire Earth's crust. Within such ideas the hypothesis which explains the Moho properties by the phase transition from a state of “block crust with shear flows of substance along the block boundaries” to the state of “non-block upper mantle with volume substance flow” is proved.