Is this statement true or false?
global warming may be a result of natural causes.
a.
true
b.
false
and this question !
certain gases in the atmosphere trap heat on earth.
what is the name of this phenomenon?
a.
the greenhouse effect
b.
global warming
c.
glacial melting
d.
cooling period

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.