Changes

     around 70.000 B.C.   

     around 70.000 B.C.   

Alternatively, this is an example of how the scientific method works:

Alternatively (this is an example of how the scientific method works):

     - From recent impacts (Siberia 1908) and space probes we know meteorites and asteroids often have

     - From recent impacts (Siberia 1908) and space probes we know meteorites and asteroids often have