  On the basis of the proposed algorithm for calculation of the hadron reaction
rates, the space-time structure of the relativistic nucleus-nucleus collisions
is studied. The reaction zones and the reaction frequencies for various types
of reactions are calculated for AGS and SPS energies within the microscopic
transport model. The relation of the reaction zones to the kinetic and chemical
freeze-out processes is discussed. It is shown that the space-time freeze-out
layer is most extended in time in the central region, while, especially for
higher collision energies, the layer becomes very narrow at the sides. The
parametrization of freeze-out hypersurface in the form of specific hyperbola of
constant proper time was confirmed. The specific characteristic time moments of
the fireball evolution are introduced. It is found that the time of the
division of a reaction zone into two separate parts does not depend on the
collision energy. Calculations of the hadronic reaction frequency show that the
evolution of nucleus-nucleus collision can be divided into two hadronic stages.
