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Which best summarizes Alfred Wegener’s idea of continental drift?
A. As new ocean crust forms along mid-ocean ridges, the continents drift apart
B. Over time, continents sink to form ocean floor as ocean floor rises to form new continents
C. All of the continents on Earth were once joined as a single continent, which has since split
apart
D. All of the continents on Earth were once joined as a single continent, which has
since been partially flooded to form separate landmasses