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Transcript
DO NOW • Take out last night’s homework – Continental Drift vs. Sea-Floor Spreading handout • Turn to your neighbor and share your answers with your neighbor. PLATE TECTONICS Plate Tectonics • The idea that Earth’s surface is broken into plates that slide slowly across the mantle • Mantle- the layer beneath the Earth’s crust Tectonic Plates Tectonic Plates What causes the plates to move? • Convection currents caused by magma The Lithosphere and Asthenosphere • The crust and the layer of the upper mantle that form plates are called the lithosphere • They rest on the upper mantle called the asthenosphere • Earth has two kinds of crust: continental crust and oceanic crust – Continents are made of continental crust, which is made up of rocks that are less dense than oceanic crust – The ocean floor is made up of oceanic crust, which is made up of rocks that are more dense than continental crust What is a plate boundary? • Plate boundaries are where the edges of plates meet • There are three types of plate boundaries • The type of boundary depends on whether the plates are moving toward each other, separating, or sliding past each other Three Types of Plate Boundaries Plate Boundaries Divergent Boundaries • Divergent boundary- form where plates diverge, or move away from each other - These boundaries are under oceans and build undersea mountain ranges called mid-ocean ridges Divergent Boundaries Convergent Boundaries • Convergent boundary- form where plates collide -The pressure and violence at convergent boundaries produces mountains, bands of volcanic activity, and deep ocean trenches Convergent Boundaries • Oceanic and Continental Crust Convergent Boundary Convergent Boundaries • Continental and Continental Crust Convergent Boundary Convergent Boundaries • Oceanic and Oceanic Crust Convergent Boundary Transform Fault Boundaries • Transform fault boundary- form where two plates slide past each other - As plates smash and grind past each other, there are many earthquakes Transform Fault Boundaries
