Plate Tectonics January 2012
Earth’s Plates • The crust is the solid layer (also called the lithosphere) • It is broken into piecescalled tectonic plates. • The tectonic plates are like the pieces of a jigsaw puzzle. • Plates intersect or meet at boundaries • Three different types of boundaries • Look at this picture, and draw each of the three types of boundaries.
Seafloor spreading • Watch this animation. • The Mid-Ocean Ridge is an example of a divergent boundary. • It can be seen from space. • It is on the ocean floor • Think: if the ocean floor spreads apart here, what must happen somewhere else?
Mountain making Convergent boundaries Example in Hawaii • Plates move toward each other • When they collide, one moves under the other • Mountains are created • Volcanoes occur
Plate movement is powerful! Mountain building Effects of plate movement
Transform boundaries No elevation, side to side only California’s San Andreas Fault
Now, it’s your turn! • Read your text (pages 324 – 328, & 334 – 337.) • Write your background paragraph telling how the Earth’s surface changes. • Gather materials • “Build” your mantle and crust • Simulate the boundaries and their movement • Can you make mountains, mid ocean ridges, and bend railroad tracks??
Homework • Complete your reading of assigned text pages tonight (324 – 328, & 334 – 337). • Write 3-4 sentences about the ways the Earth’s surface can change as a result of plate movement at boundaries. • Come prepared to test your knowledge in our lab.