Plate 8 th Grade Science With the marvelous Mr. Christine Tectonics
What is Plate Tectonics? Remember what a theory was? –A scientific Theory is a well tested concept that explains many observations. So, the Theory of Plate Tectonics is … –Pieces of the Earth’s Lithosphere are in slow, constant motion, driven by convection currents in the mantle.
What is a plate? A plate is a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of oceanic and continental crust.
Remember Convection The transfer of heat by movement of a fluid. This causes plate movement
Plate Boundaries The Earth is broken up into many plates So, the plates meet at areas called boundaries Plate Boundaries: Where edges of world’s plates meet. 3 types –D–Divergent, Convergent, and Transform
Divergent Boundary Divergent Boundary: Place where two plates move apart or diverge. Ocean = Mid Ocean Ridge Land = Rift Valley