The theory of seafloor spreading was proposed in 1960 by
a. Alfred Wegener.
b. Harry Hess.
c. Albert Einstein.
d. Andrija Mohorovicic.
Question 2
An element that is malleable, ductile, and a good conductor of heat and electricity would be classified as a
a. metalloid.
b. semimetal.
c. metal.
d. nonmetal.