Plate Boundaries Essential Questions 1 What is plate

Plate Boundaries

Essential Questions: 1. What is plate tectonics? 2. What are three types of plate boundaries? 3. What crustal features are formed at plate boundaries?

Quick Action – INB Template 1. Cut out the INB Template. Paste it into your notebook. 2. The next two pages will go on top of this page to make a 3 page flip book. 3. This Template is page 3. © Kesler. Science. com

Quick Action – INB Template Page 1 © Kesler. Science. com Page 2

Plate Boundaries Seven Continents today © Kesler. Science. com

Plate Boundaries Continental Drift Theory Alfred Wegener developed theory that the continents drift. At the time he did not know the mechanism that made this happen. Sea-Floor Spreading Harry Hess discovered that magma was rising on the sea floor causing it to spread. The hot magma rising in the mantle caused the spreading on the sea floor and the large pieces of crust (tectonic plates) to move. Theory of Plate Tectonics These two theories lead to the Theory of Plate Tectonics. © Kesler. Science. com

Plate Boundaries Plate Tectonics is theory that Earth's outer crust (lithosphere) is divided into several plates that glide over the plastic-like and less ridged asthenosphere (upper mantle). © Kesler. Science. com

Plate Boundaries What is the engine that moves the plates? Convection Currents • Transfers energy in the mantle • Causes the hotter magma in the mantle to rise • Causes the cooler magma in the mantle to sink © Kesler. Science. com

Quick Action – INB Template Type of Boundary Complete the table as you move through the Power. Point Presentation. Glue into your notebook as a reference. Direction of Movement Description/Features of Plate Boundary Examples Ocean-Ocean Ocean-Continent Divergent Plate Boundary Transform Plate Boundary Convergent Plate Boundary Collision Convergent Plate Boundary Subduction © Kesler. Science. com Sketch of Boundary

Plate Boundaries What happens at plate boundaries? Plates do one of 3 things. 1. Converge (colliding or coming together) 2. Diverge (dividing or moving apart) 3. Transform (sliding past each other) © Kesler. Science. com Converge (destroys crust) Diverge (creates crust) Transform (neither destroys or creates crust)

Quick Action – Plate Boundaries Ready for a song? The melody is to the “Adam’s Family. ” Converging is colliding, Diverging is dividing, Transform is sliding, We are the plate boundaries. Dah na na na. <Snap, Snap> Bet you can’t get that out of your head! © Kesler. Science. com

Plate Boundaries Divergent boundaries – dividing or moving apart • Two oceanic crusts diverge and create a mid-ocean ridge (mountains under the ocean). • This process is call sea-floor spreading. • New crust is created. The Mid-Atlantic Ridge actually comes above the ground in Iceland. © Kesler. Science. com

Plate Boundaries Divergent boundaries – dividing or moving apart • Two continental crusts diverge and create a rift valley. • New crust is created. • Example is the Great Rift Valley in Africa • Over millions of years water will eventually fill the valley. © Kesler. Science. com

Plate Boundaries Transform boundaries • Plates slip sideways past each other creating earthquakes. • Crust is neither created or destroyed. • Many of these boundaries are found on the sea floor. • The most famous transform boundary is the San Andreas fault in California. © Kesler. Science. com

Plate Boundaries What happens when plates converge or collide? • Continental/Continental = folded mountains (Himalayas). • Continental/Oceanic = volcanoes form (Cascades in Oregon and Washington) • Oceanic/Oceanic = Volcanic arc of islands form(Aleutian Islands in Alaska) © Kesler. Science. com

Plate Boundaries Converging boundary -continental/continental boundary. • Two continental crusts collide and push against each other. • This pressure causes both plates to rise creating folded mountains. • Not a subduction zone Himalaya Mountains © Kesler. Science. com

Plate Boundaries Converging boundary - continental/oceanic boundary • • The ocean crusts goes below the continental crust because its more dense. Volcanoes form on the continent. A trench forms at the place when the plates collide. Subduction zone Cascade Volcanoes in WA, OR and CA Old crust is destroyed © Kesler. Science. com

Plate Boundaries Converging boundary - oceanic/oceanic boundary • Two oceanic crusts collide and push against each other. • The older crust goes below the other one and creates a volcanic arc of islands. • Subduction zone Old crust is destroyed © Kesler. Science. com Aleutian Islands in Alaska

Quick Action – INB Template © Kesler. Science. com

Quick Action – Plate Boundaries Let’s review the three types of plate boundaries. • On three slips of paper write down C, D, or T. Get with a partner • Decided which type of boundary you want to “act out. ” • Demonstrate to the class your “boundary” and have the class determine which type of boundary you are representing by holding up the corresponding letter, which represents converging, diverging and transform boundaries. © Kesler. Science. com

Plate Boundaries Ring of Fire • A long chain of volcanoes that surround the Pacific Ocean. • One of the most geologically active area on Earth. • Site of frequent earthquakes and volcanic eruptions. • Caused by plate boundaries converging, diverging and transforming. © Kesler. Science. com

Quick Action – INB Template Glue this side to Notebook after creating pocket with tabs Convergent Plate Boundaries © Kesler. Science. com Make pocket tabs in your notebook. Glue this side to Notebook after creating pocket with tabs Transform Glue this side to Notebook after creating pocket with tabs Divergent

Quick Action – INB Template Cut out plate boundary cards and put them in the correct pocket in your notebook. © Kesler. Science. com

Quick Action – INB Template Plate Boundaries © Kesler. Science. com

Check for Understanding Can you… 1. Explain plate tectonics? 2. Name three types of plate boundaries and describe their movement? 3. Relate plate boundaries to the formation of crustal features: such as mountains, trenches, volcanoes and ridges? © Kesler. Science. com