The document discusses the theories of continental drift and sea floor spreading. It provides biographical information on Alfred Wegener and Harry Hess, the scientists who proposed these theories. Wegener found three pieces of evidence to support his hypothesis that all continents were once joined together in a single landmass called Pangaea: matching landforms, fossil evidence, and evidence from past climates. Hess proposed the theory of sea floor spreading, which posits that new ocean floor material rises at mid-ocean ridges and spreads outwards, pushing older material to the sides. He provided three pieces of evidence to support this: pillow lava formations on the ocean floor, matching magnetic patterns on either side of ridges, and evidence from rock samples showing older

1.  Sabrina Jackson