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Ava had read about continental drift and that it had now become a theory. What information caused the hypothesis of continental drift to become a theory

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Continental drift theory

Step-by-step explanation:

Movement of plates in the lithosphere (plate tectonics) caused the hypothesis of continental drift to become a theory

  • Alfred Wegener first presented the hypothesis that the continents had once formed a single landmass, called Pangaea, before breaking apart and drifting to their present locations
  • Wegener thought all the continents were once joined together before breaking up and drifting to their current positions
  • Most of Wegener's observations about fossils and rocks were correct but he was wrong on a couple of key points
  • Plate tectonics is now the widely accepted theory that Earth's crust is fractured into rigid, moving plates
  • In the 1960's, scientists discovered the plate edges through magnetic surveys of the ocean floor and through the seismic listening networks built to monitor nuclear testing
  • Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core
  • The plates act like a hard and rigid shell compared to Earth's mantle and this strong outer layer is called the lithosphere
  • The lithosphere includes the crust and outer part of the mantle
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