The theory of continental drift was proposed by alfred wegner based on what observation?
a. he noticed the continents were in motion.
b. he observed volcanoes were creating new crust.
c. he observed earth's average temperature increasing.
d. he saw that continent edges fit together like pieces of a jigsaw puzzle.

D. He saw that the continent fits together like pieces of a jigsaw puzzle

as well, he had evidence from having similar rock formations from places that seemed to "connect", and he found fossils of the same dinosaur in different areas, that would have been impossible to go to because of the size and the inability to swim by the dinosaurs