Question

What was unknown to scientists during Wegener's time?


A. Fossils were found in many places.
B. Earth's crust is made up of plates that move
C. mountain ranges of some continents lined up
D. the coasts of some continents fit together

Answer 1

During Wegener's time, the concept that **B. Earth's crust is made up of plates that move** was not known. Although Wegener proposed the idea of continental drift in 1912, he did not have the scientific evidence or understanding of plate tectonics, which was developed later in the mid-20th century. The movement of tectonic plates explains how continents could drift apart and provides a mechanism for Wegener's observations. The other options (A, C, and D) were known or observed by Wegener and contributed to his hypothesis of continental drift.