Plate Tectonics and Continental Drift. Continental drift Many of the continents appear like puzzle pieces that fit together Many of the continents appear.

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Plate Tectonics and Continental Drift

Continental drift Many of the continents appear like puzzle pieces that fit together Many of the continents appear like puzzle pieces that fit together Puzzle activity Puzzle activity

Continental drift Continental drift is the theory that continents move apart Continental drift is the theory that continents move apart Alfred Wegener proposed the theory Alfred Wegener proposed the theory Similar plants and animal species are found on continents far apart Similar plants and animal species are found on continents far apart

Pangaea Means “all Earth” Means “all Earth” Existed 245 million years ago Existed 245 million years ago 180 million years ago it split into 2 pieces 180 million years ago it split into 2 pieces 65 million years ago it split even more 65 million years ago it split even more

Sea floor spreading Process that creates new oceanic lithosphere as older material is pulled away Process that creates new oceanic lithosphere as older material is pulled away Magnetic reversal proved sea floor spreading Magnetic reversal proved sea floor spreading Sea floor spreading demo Sea floor spreading demo

Plate Tectonics The idea that the Earth’s landmasses have broken apart, rejoined, and moved to other parts of the globe The idea that the Earth’s landmasses have broken apart, rejoined, and moved to other parts of the globe Takes place slowly Takes place slowly

Tectonic plates Pieces of the lithosphere Pieces of the lithosphere There are 7 major plates that vary in size and thickness There are 7 major plates that vary in size and thickness

Tectonic plate movement 3 possible causes for plate movement: 1) Ridge push 2) Slab pull 3) Convection Mantle convection video (1:30): watch?v=Z9Hr7V1S0pI&fea ture=related watch?v=Z9Hr7V1S0pI&fea ture=related

Plate boundaries 3 types of plate boundaries 1) Convergent 3 types: Continental/continental Continental/continental Oceanic/oceanic Oceanic/oceanic Continental/oceanic Continental/oceanic 2) Divergent 3) Transform

Homework Read p Answer questions 1-4 on p. 180