THE ORIGIN OF MAN 7 



ance of heated matter to condensation. Then the 

 scattered nebulous matter became drawn into 

 nuclei. The nebula consisting of planetesimals 

 which by the way are particles of nebulous mat- 

 ter, thus passed into the planetary system. 

 Therefore our earth was made by the condensa- 

 tion of atoms thrown out from a sun or mass. 

 This belief is known as the planetesimal hypo- 

 thesis and is the scientific theory of the formation 

 of our universe. 



As the earth gradually became larger and its 

 attraction stronger so as to hold the gases emitted 

 from the volcanos, it gradually came to have an 

 atmosphere. When the earth reached its present 

 size, the atmosphere gave rise to the processes of 

 solution, to weathering of rocks, and to the wash- 

 ing together of sediments formed on the earth's 

 face, and the resulting finer materials gravitated 

 to the lower places and eventually into the 

 oceanic basins. This then explains the formation 

 of our atmosphere and oceans. 



