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Continental Drift Theory First person to think the continents fit together – mapmaker, Abraham Ortelius First to propose the idea of Continental Drift was meteorologist – Alfred Wegener – Hypothesis that continents were connected but broke apart 200 million years ago and drifted to current position Pangaea Wegener suggested the continents were once connected as one large landmass called Pangaea The Earth appears to be cracked into pieces called plate tectonics. (Like a cracked egg shell) 5. Some plates move in opposite directions (Divergent). Some plates collide (Convergent) Some plates slide past each other (transform boundary) Divergent Boundaries Two plates that are moving apart. This is seafloor spreading Hot material rises to create new lithosphere Volcanoes and earthquakes common Rift valley – the crack Deep-sea trenches Ex: Mid-Atlantic Ridge Convergent Plate Boundaries Two plates move together A: Continental plate vs. continental plate – Same densities, neither sin
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