The correlation between solar activity, seismic energy of the Earth, m
icrobiological characteristics and flows of particles registered by ne
utron monitors for the period 1969-1992 were investigated. The notion
of seismicity as a part of a unified physical process in a system <<Su
n-Earth>> lies at the basis of research. From this point of view, the
Sun, the Moon, interplanetary environment, magnetosphere, ionosphere o
f the Earth and the Earth itself with terrestrial processes leading to
earthquakes represent a unified physical system. A direct correlation
of seismic activity with biological indices and flows of particles re
gistered on the Earth by neutron screen monitors, and an inverse corre
lation with solar activity are observed.