If a theory is studied in let's say the 17th century, the theory has had many years to be studied and explained by many different people many different ways.
Answer:

Explanation:
= Permittivity of free space = 
A = Area
h = Altitude = 600 m
Electric flux through the top would be
(negative as the electric field is going into the volume)
At the bottom

Total flux through the volume

Electric flux is given by

Charge per volume is given by

The volume charge density is 
The order of magnitude of my age in seconds is 10^9. I think you'll find that this is true for anyone who is 32 or older.
Many ways, but some of the most famous are kicks (side, back, front, snap) or a smash.
Hope it helped! :)