11.   The earth would be a frozen ball if it were not for the radiant heat of the sun.

12.   The earth was spongy from rain.

13.   The mindless obstinacy of those people who continue to insist that the earth is flat.

14.   The average man, says Shaw,can advance not a single reason for thinking that the earth is round.

15.   Just why do we believe that the earth is round?

16.   But it does not follow that the earth is spherical.

17.   The Astronomer Royal, who ought to know, tells me that the earth is round.

18.   People can sail ships round the world,and reach the places they aim at,by calculations which assume that the earth is spherical.

19.   It will be seen that my reasons for thinking that the earth is round are rather precarious ones.

20.   He refuted the idea that the earth was the center of the universe.