In 1915, a German scientist named 4) proposed the 5) __. He noticed that identical 6)
were
found separate continents, and it was unlikely the
animals would have been able to swim across the
oceans. He also observed that each 7) – appears
to fit together like a puzzle. He theorized that all of the
current continents were once joined together into a
supercontinent named 8) which broke apart,
and the landforms slowly drifted apart into their
current positions.