Which statement best describes an epidemiologic transition? 

A)  It happens before a demographic transition. 
B)  It happens when mortality is due mainly to childhood infectious diseases rather than adulthood chronic diseases. 
C)  It happens when mortality is due mainly to adulthood chronic diseases rather than childhood infectious diseases. 
D)  It is the same as a demographic transition.

Which term refers to the waste that results from processing ore? 

A)  tailings 
B)  gangue 
C)  acid mine drainage 
D)  spoil