AS A RESULT OF HEATING BY THE PROTO -SUN WHEN THE SOLAR SYSTEM WAS FORMING

Question

(A) THERE ARE ABSOLUTELY NO ICES TO BE FOUND IN THE OUTER SOLAR SYSTEM .(B) ROCKY MATERIAL IS NOT FOUND IN THE INNER SOLAR SYSTEM ( C ) VOLATILE MATERIAL IS PERFECTLY EVENLY DISTRIBUTED THROUGHOUT THE SOLAR SYSTEM . ( D ) THE INNER SOLAR SYSTEM HAS MUCH MORE VOLATILE MATERIAL THAN THE OUTER SOLAR SYSTEM . ( E ) THE INNER SOLAR SYSTEM HAS MUCH LESS VOLATILE MATERIAL THAN THE OUTER SOLAR SYSTEM . 

Answer 1

The tremendous heat from the protosun caused molecules of hydrogen and helium to exceed the escape velocities of the inner, less massive rocky planets (Mercury, Venus, Earth, Mars) with lower escape velocities than the outer, more massive gas giants.  These gas giants (Jupiter, Saturn, Uranus and Neptune) had more mass, higher escape velocities, and received less solar heating/radiation, so they were cooler and the hydrogen and helium molecules moved more slowly and were thus retained in the atmospheres.