One important effect of the lowering of sea levels during earth's geologic history has been
a) the breakup of the continents.
b) the loss of fresh water sources.
c) the disappearance of inland seas.
d) the formation of new coral reefs.

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.