Definition of knell. 1  transitive verb. : 2  to summon or announce by or as if by a knell. 3  intransitive verb. 4  1 : to ring especially for a death, funeral, or disaster : toll. 5  2 : to sound in an ominous manner or with an ominous effect.
For the journal, see Demography (journal) . Demography is the statistical study of populations, including of human beings. As a very general science, it can analyze any kind of dynamic living population, i.e., one that changes over time or space (see population dynamics).
Seismologists are the scientists that study earthquakes and the related activities to earthquakes. The composition and structure of the earth is also a part of what seismologists research.... Seismologists are the scientists that study earthquakes and the related activities to earthquakes. The composition and structure of the earth is also a part of what seismologists research.... Star Gazing