Which of these energy resources does not pollute when used? a. coal b. petroleum c. natural gas d. hydroelectric

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

Idon't know how to do this but maybe ask your mom or dad