What countries in africa south of the sahara generally have the least problem w hunger

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;

Ibelieve its c.  that to me seems like the closest answer 

1. why do astronomers think that there may be other advanced civilizations?
because  it was discovered that there are other planets like earth out there, able to  accommodate life forms.
2. what technologies are astronomers using to look for life on other planets? why?  
they  have used radio telescopes, but now they use laser telescopes   to track laser communications.