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Plate Boundaries Earth’s Crust • Earth’s crust is made up of giant pieces of rock that “float” on top of the mantle. • The plates move slowly across Earth’s surface (About 10cm per year). • These plates moving are called Plate Tectonics. Plate Boundaries • The places where one plate meets another is called a Plate Boundary. • There are 3 types of plate boundaries: 1. Converging 2. Diverging 3. Sliding Converging Boundary • When two plates move toward one another. • Usually one plate moves under another. Which Graham Cracker demo was that? Creates mountains and valleys. Diverging Boundary • When two plates move away from one another. • Melted rock rises to fill space. • Can be called sea-floor spreading. Which Graham Cracker demo was that? Creates valleys and volcanoes. Sliding Boundary • When two plates slide past each other Which Graham Cracker demo was that? Can show linear lines from sliding. Quick Check! Divergent Boundaries Sliding Boundary Convergent Boundary