What was the unknown to scientists during Wegener's time?
A. earths crust is made of plates that move
B. mountain ranges of some continents lined up
C. the coasts of some continents fit together
D. fossils were found in many places
A. earths crust is made of plates that move
B. mountain ranges of some continents lined up
C. the coasts of some continents fit together
D. fossils were found in many places