Fill the blanks with the correct words from the word list The German scientist Alfred Wegener, proposed in a theory of continental drift to explain how the Earth's land came to be where they are now. The theory was based on the Earth’s continents once fitting together like a giant jigsaw puzzle.

explains how similar animals and plants could have lived at the same time on continents that are now widely separated by ocean, and how identical mountain ranges in different continents were once joined.

250 million years ago the Earth's continents were once joined together in one giant supercontinent called Pangaea. Slowly, over millions of years broke into and. These have drifted apart forming the smaller continents of today.

Since the 1960s, detailed geological studies of the Earth’s crust have greatly increased our understanding of how the continents move. The theory of continental drift has been rep