Magnetic reversals have helped to support a.
the theory of Pangaea.
c.
sea-floor spreading.
b.
the age of the Earth.
d.
the theory of Gondwana.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided