1Chapter 10, Section 2 Chapter 10, Section 2 Objective 1 Standards3b. Students know the principal structures that form at the 3 different kinds of plate boundaries.Objective 1Summarize the theory of plate tectonics.Objective 2Identify and describe the 3 types of plate boundaries.Objective 3List and describe 3 causes of plate movement.AssessmentFlap Book, Chapter TestReviewDaily Bellwork, Science Starters, Standards PracticeChapter 10, Section 2Movie on the Rock Cycle??
2Key TermsCreate a flashcard for each of the following terms (found on p.247 in your text book).Plate tectonicsLithosphereAsthenosphereIf you finish early, study your flashcards!
3Plate TectonicsThe theory of Continental Drift led to the theory of PLATE TECTONICS.PLATE TECTONICS explains how large pieces of the lithosphere, called plates, move and change shape.Earth’s crust and the rigid, upper part of the mantle = LITHOSPHERE. This is the thin outer shell of Earth (like an Egg shell).The lithosphere is broken into several pieces called TECTONIC PLATES.The TECTONIC PLATES ride or float on the ATHENOSPHERE (part of the Earth’s mantle that is flowing slowly).
4Earth’s CrustOCEANIC CRUST = dense, made of iron and magnesium-rich rock.CONTINENTAL CRUST = low density, made of rock rich in silica.Both kinds of crust are always moving with the tectonic plates they are riding on.
6Earthquakes and Volcanoes Frequent earthquakes in an area are evidence the 2 or more tectonic plates meet in that area.Many volcanoes form from plate motion and help scientist identify plate boundaries.
7Quick Check!!The upper and hard part of the Earth’s mantle is called the ______________________.The two types of crust are continental and ____________.Scientists have identified about ______ major tectonic plates.Name one plate: _________________________________________________________________________________________________________________________________________________________________________________
8Types of Plate Boundaries Most of the dramatic changes in Earth’s crust---Volcanoes and Earthquakes---occur at Plate Boundaries.DivergentConvergentTransform
9Divergent Boundaries 2 plates move away from each other. Magma from the athenosphere rises to the surface as the 2 plates move apart, the magma cools and creates new oceanic lithosphere(sea-floor spreading).
10Convergent Boundary2 plates collide3 types of Collisions
11Types of Collisions Oceanic Lithosphere vs. Continental Oceanic is denser so it sinks under the continental lithosphereCalled a SUBDUCTION ZONEDeep-ocean trenches and Volcanoes form at SUBDUCTION ZONESContinental vs. Continental LithosphereNeither plate subductsColliding edges crumple and thicken causing uplift that forms large mountain ranges.Oceanic vs. Oceanic LithosphereOne plate subducts under the otherDeep ocean trench formsMagma rises to form and ISLAND ARC, or chain of Volcanic Islands
12Transform Boundaries 2 plates slide past each other horizontally The edges of the plates scrape and jolt along each other. This motion is felt as Earthquakes.No Magma is produced
13Summary—Plate Boundaries DivergentPlates moving away from each other to form rifts and mid-ocean ridgesNorth American and Eurasian plates at the Mid-Atlantic Ridge. Red Sea.ConvergentPlates moving toward each other and colliding to form ocean trenches, mountain ranges, volcanoes, and island arcsSouth American and Nazca plates at the Chilean trench along the west coast of South America. Himalyan mountains, Japan.TransformPlates sliding past each other while moving in opposite directionsNorth American and Pacific Plates at the San Andreas fault in California.
14Quick Check!!Name the 3 types of plate boundaries: ____________________________________________________________________________________________________________San Andreas fault is an example of a _________ boundary.2 plates moving apart is a _________ boundary.Mid-Atlantic Ridge is causing South America and _______ to spread apart.
15Mantle ConvectionRidge PushSlab PullCauses of Plate Motion
16Mantle ConvectionHeat from the Earth’s core heats the material in the Mantle.The heated material expands and becomes less dense therefore rising around the cooler, denser material above it.This cycle continues, this is called CONVECTION.Convection currents cause the tectonic plates above it to move.C
19Tectonic Plate Boundary Activity In your group you will create each of the 3 plate boundaries using modeling clay.p. 253 quick lab and/or modeling activity pdf file uner Ch. 10 folder.Take pics of finished models? Print and have students label?
20AssessmentMake a 3-Flap Book showing each of the types of plate boundaries. For each flap include: --Definition/Description --Drawing --Real World Example
21Daily QuizPut into Responders and/or project using SMART notebook. 3 Questions a day.Oral and on small papers??